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Liu Y.,Jiangsu University | Pan J.,Jiangsu University | Liu Y.,Hangzhou Energy Engineering Design Co.
Huagong Xuebao/CIESC Journal | Year: 2013

Based on experimental results, kinetics and two-film theory, the mass transfer-reaction kinetics was experimentally studied for NO removal using a combination process of UV/H2O2 oxidation and CaO absorption (UV/H2O2-CaO process) in a lab-scale UV-bubbling column reactor. The mass transfer-reaction process of NO absorption was analyzed to determine its rate controlling step and some measures that can effectively strengthen NO absorption, and some key kinetic parameters were measured and a theoretical model for NO absorption was established. The results indicate that under experimental conditions, the rate of NO absorption almost linearly increases with NO concentration. With increase of H2O2 and CaO concentrations, the efficiencies of NO removal increase greatly at first, and then its change is small. The absorption of NO by combined UV/H2O2-CaO process follows pseudo-first-order kinetics. The NO absorption rate can be effectively strengthened by increases of turbulence in gas phase body, gas-liquid contact area and NO partial pressure. The values calculated from the theoretical model of NO absorption are in good agreement with the experimental values. © All Rights Reserved. Source


Liu Y.,Jiangsu University | Pan J.,Jiangsu University | Zhang J.,Nanjing Southeast University | Tang A.,Jiangsu University | Liu Y.,Hangzhou Energy Engineering Design Co.
Industrial and Engineering Chemistry Research | Year: 2012

The mass transfer-reaction kinetics of NO removal from flue gas by using a UV/Fenton-like reaction was investigated in a lab-scale UV-bubbling column reactor. The results show that the NO absorption rate increases with the increase of UV radiation intensity and H 2O 2 concentration, but the growth rates become smaller gradually. NO absorption rates increase with the increase of Cu 2+ concentration and NO concentration but decrease with the increase of SO 2 concentration. The absorption of NO by using a UV/Fenton-like reaction is a pseudo-first-order fast reaction with respect to NO, thus the chemical reaction rate of NO removal is much larger than the mass transfer rate, and the mass transfer process is the main control step of the NO absorption process. NO absorption can be further strengthened by increasing the gas phase mass transfer coefficient, the gas-liquid specific interfacial area, and the NO partial pressure. The validation results of the NO absorption rate equation indicate that the calculated values are in good agreement with the experimental values. The maximal average error is less than 2.0%, and the maximal error is less than 10.1% between the calculated values and the experimental values. © 2012 American Chemical Society. Source

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