Simultaneous removal of SO2, NO and particulate by pilot-scale scrubber system

Abstract

SO x and NO x have both previously been identified as primary precursors of acid rain, and thus the abatement of SO x and NO x emissions constitutes a major target in the field of air pollution control. In this study, the efficacy of a pilot-scale scrubber was evaluated with regard to the simultaneous removal of SO 2 , NO and particulate with wet catalysts. The removal efficiencies of particulate were measured to be 83, 92 and 97% with catalyst flux of 0.5, 0.8 and 1.5 L/min, respectively. The average removal efficiencies of particulate with different nozzles were approximately 94 and 90% with FF6.5 (5/8 in.) and 14 W (1.0 in.) nozzles, respectively. At least 96-98% of particulate and SO 2 were removed, regardless of the stage number of reactor. In a one-stage scrubber, 83.3% removal efficiency of NO was achieved after 48 hours; however, the two-stage scrubber achieved an NO removal efficiency of 95.7%. Regardless of the liquidgas ratio, SO 2 and particulate were removed effectively, whereas NO was removed about 84% and 74% under liquidgas ratio conditions of 39.32 L/m 3 and 27.52 L/m 3 , respectively. In experiments using STS and P.P. pall ring as packing material, particulate and SO 2 removal efficiency values in excess of 98% were achieved; however, NO removal was correlated with the different packing materials tested in this study. With the above optimum operation conditions, even after 20 hours, the removal efficiency for NO stayed at 95% or higher, the removal efficiency for SO 2 stayed at 97% or higher, and the removal efficiency for particulate stayed at 92% or higher. In accordance, then, with the above results, it appears that this process might be utilized in scrubber systems, as well as systems designed to simultaneously remove particulate, SO 2 and NO from flue gas.

Comparison of packing materials in biofilter system for the biological removal of hydrogen sulfide: Polypropylene fibrils and volcanic stone

“…These parameters differ under various operation conditions and also vary with the type of biofilter packing materials employed. These parameters, then, were also utilized as key factors in the design of an optimal biofilter [2,11,17].…”

Comparative life cycle assessment of plasma-based and traditional exhaust gas treatment technologies

“…Traditional technology -Wet flue gas desulphurization with selective catalytic reduction (WFGD+SCR) WFGD with SCR is a two stage NOx/SOx removal process most frequently used to reduce emissions from sulfur-rich coal-fired utility boilers (Jiang, 2000, Jung et al, 2007. The WFGD system is usually installed after a baghouse or an electrostatic precipitator.…”

Green shipping: Marine engine pollution abatement using a combined catalyst/seawater scrubber system. 1. Effect of catalyst

“…As is well known, NO x are mostly emitted as NO and, due to its poor solubility, wet-adsorption must be promoted by adding an oxidant that forms NO 2 , thus promoting NO x solubility [24][25][26][27]. Whereas such an approach is in principle possible, it must be noted that on-board storage of chemicals is undesirable due to both space/volume constrains and security issues.…”