TY - JOUR N2 - The paper presents results of experimental studies on removal of NOx from flue gas via NO ozonation and wet scrubbing of products of NO oxidation in NaOH solutions. The experiment was conducted in a pilot plant installation supplied with flue gas from a coal-fired boiler at the flow rate 200 m3/h. The initial mole fraction of NOx,ref in flue gas was approx. 220 ppm, the molar ratio X = O3/NOref varied between 0 and 2.5. Ozone (O3 content 1÷5% in oxygen) was injected into the flue gas channel before the wet scrubber. The effect of the mole ratio X, the NaOH concentration in the absorbent, the liquid-to-gas ratio (L/G) and the initial NOx concentration on the efficiency of NOx removal was examined. Two domains of the molar ratio X were distinguished in which denitrification was governed by different mechanisms: for X ≤ 1.0 oxidation of NO to NO2 predominates with slow absorption of NO2, for X >> 1.0 NO2 undergoes further oxidation to higher oxides being efficiently absorbed in the scrubber. At the stoichiometric conditions (X = 1) the effectiveness of NO oxidation was better than 90%. However, the effectiveness of NOx removal reached only 25%. When ozonation was intensified (X ≥ 2.25) about 95% of NOx was removed from flue gas. The concentration of sodium hydroxide in the aqueous solution and the liquid-to-gas ratio in the absorber had little effect on the effectiveness of NOx removal for X > 2. L1 - http://www.czasopisma.pan.pl/Content/84734/PDF/03-paper-Jakubiak.pdf L2 - http://www.czasopisma.pan.pl/Content/84734 PY - 2012 IS - No 3 October EP - 358 DO - 10.2478/v10176-012-0031-0 KW - de-NOx KW - nitric oxide KW - ozonation KW - absorption A1 - Jakubiak, Maciej P. A1 - Kordylewski, Włodzimierz K. PB - Polish Academy of Sciences Committee of Chemical and Process Engineering DA - 2012 T1 - Pilot-scale studies on NOx removal from flue gas via NO ozonation and absorption into NaOH solution SP - 345 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/84734 T2 - Chemical and Process Engineering ER -