NOx removal from a flue gas in a corona discharge-catalyst hybrid system
NOx removal from a flue gas in a corona discharge-catalyst hybrid system
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DOI：
10.1016/j.cattod.2003.11.031
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发表时间：
2004-02
期刊：
影响因子：
5.3
通讯作者：
M. Dors;J. Mizeraczyk
中科院分区：
文献类型：
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作者：
M. Dors;J. Mizeraczyk
这项工作的目的是研究在室温 (22°C) 氨存在的情况下，使用由直流电晕放电和催化剂组成的混合系统去除 NOx。实验过程如下。在不锈钢空心针和黄铜制成的扁平网之间产生正直流电晕放电。针垂直于网放置，保持电极间距离为 40mm。空心针的外径和内径分别为2和1.6mm。本研究中使用的催化剂是沉积在直径 5-6mm 的 Al2O3 球上的一层 V2O5 和 TiO2。将它们放置在网上，使管和球之间的距离为 30mm。催化剂被NH 3 饱和或不含NH 3 。 N2(80%):O2(5%):CO2(15%):NO(200ppm)的混合气体以1l/min的流速流过管子。通过空心针将氨添加到气体混合物中，当使用不含NH 3 的催化剂时，氨的浓度为400ppm；当使用被NH 3 饱和的催化剂时，氨的浓度为30ppm。调查结果表明，混合动力系统（采用NH3饱和催化剂）可去除高达96%的NOx，能源效率为3.4g NO/kWh。如果没有催化剂，氨气混合物中“纯”电晕放电的 NOx 去除率较低（高达 66%）。能源效率也较低（约 1.8gNO/kWh）。所得结果表明，所研究的电晕放电-催化剂混合系统对于氮氧化物去除具有吸引力，因为它在氮氧化物分解和能量消耗方面都具有相对较高的效率。
The objective of this work was to investigate NOxremoval with a hybrid system consisting of a dc corona discharge and a catalyst at a room temperature (22°C) in the presence of ammonia. The experimental procedure was as follows. A positive dc corona discharge was generated between a stainless steel hollow needle and a flat mesh made of brass. The needle was placed perpendicularly to the mesh maintaining the interelectrode distance of 40mm. The outer and inner diameters of the hollow needle were 2 and 1.6mm, respectively. The catalyst used in this investigation was a layer of V2O5and TiO2deposited on Al2O3globules of 5–6mm in diameter. They were placed on the mesh so that the distance between the tube and the globules was 30mm. The catalyst was either saturated with NH3or free of NH3. A gas mixture of N2(80%):O2(5%):CO2(15%):NO (200ppm) flowed through the tube with a flow rate of 1l/min. Ammonia was added to the gas mixture through a hollow needle in a concentration of either 400ppm when NH3-free catalyst was used or 30ppm when catalyst saturated with NH3was used. Results of the investigation showed that the hybrid system (with NH3-saturated catalyst) removes up to 96% of NOxwith an energy efficiency of 3.4g NO/kWh. Without the catalyst, NOxremoval in the “pure” corona discharge in the gas mixture with ammonia was lower (up to 66%). Also the energy efficiency was lower (about 1.8gNO/kWh). The obtained results showed that the investigated corona discharge-catalyst hybrid system is attractive for NOxremoval because of relatively high efficiency both in NOxdecomposition and energy consumption.