Experimental aspects of combined NOx and SO2 removal from flue-gas mixture in an integrated wet scrubber-electrochemical cell system.
Experimental aspects of combined NOx and SO2 removal from flue-gas mixture in an integrated wet scrubber-electrochemical cell system.
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DOI：
10.1016/j.chemosphere.2009.04.013
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发表时间：
2009-07
期刊：
影响因子：
8.8
通讯作者：
K. C. Pillai;Sang J Chung;Thasan Raju;I. Moon
中科院分区：
文献类型：
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作者：
K. C. Pillai;Sang J Chung;Thasan Raju;I. Moon
本文研究了不同操作条件对模拟烟气中NO-SO2-空气混合物在洗涤塔中同时脱除NOx和SO2的影响。气体成分被吸收到6 M HNO 3电解液在洗涤器中的逆流模式，并被氧化去除的Ag（II）介体氧化剂电化学产生的电化学电池设置。电化学电池与洗涤器装置的集成确保了Ag（II）介体的连续再生及其重复再利用用于NOx和SO2去除目的，从而避免了：（1）连续使用化学品进行氧化和（2）产生二次废物。考察了填料（拉希玻璃环、拉希聚偏氟乙烯环、Jaeger三组分全氟烷氧基球）、NO和SO2进料浓度（100- 400 ppm NO和100- 400 ppm SO2）、表观气速（0.061-0.61ms-1）和液速（0.012-0.048ms-1）对反应的影响。具有高表面积的拉希玻璃环提供最高的NO去除效率。NO和NOx在较高的进料浓度下表现出减少的趋势。当SO2共存时，氮组分的去除更快，也更大。而气体流量降低的NO和NOx的去除效率，液体流量增加它。流速的影响进行了分析，在气/液停留时间和表观液体速度/表观气体速度比。在所有条件下，SO2的去除是完全的。
The objective of this work was to study the effect of some operating conditions on the simultaneous removal of NOxand SO2from simulated NO–SO2–air flue-gas mixtures in a scrubber column. The gaseous components were absorbed into 6M HNO3electrolyte in the scrubber in a counter-current mode, and were oxidatively removed by the Ag(II) mediator oxidant electrochemically generated in an electrochemical cell set-up. The integration of the electrochemical cell with the scrubber set-up ensured continuous regeneration of the Ag(II) mediator and its repeated reuse for NOxand SO2removal purpose, thereby avoiding: (1) the usage of chemicals continuously for oxidation and (2) the production of secondary waste. The influences of packing material (raschig glass rings, raschig poly(vinylidene) fluoride rings, Jaeger tri-pack perfluoroalkoxy spheres), feed concentrations of NO and SO2(100–400ppm NO and 100–400ppm SO2), superficial gas velocity (0.061–0.61ms−1) and liquid velocity (0.012–0.048ms−1) were investigated. The raschig glass rings with high surface area provided highest NO removal efficiency. NO and NOxshowed decreasing abatement at higher feed concentrations. The removal of nitrogen components was faster and also greater, when SO2co-existed in the feed. Whereas the gas flow rate decreased the removal efficiency, the liquid flow rate increased it for NO and NOx. The flow rate effects were analyzed in terms of gas/liquid residence time and superficial liquid velocity/superficial gas velocity ratio. SO2removal was total under all conditions.