NO/sub x/ reduction after treatment system using nitrogen nonthermal plasma desorption
NO/sub x/ reduction after treatment system using nitrogen nonthermal plasma desorption
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DOI：
10.1109/tia.2005.851565
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发表时间：
2005-07
影响因子：
4.4
通讯作者：
M. Okubo;M. Inoue;T. Kuroki;Toshiaki Yamamoto
中科院分区：
文献类型：
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作者：
M. Okubo;M. Inoue;T. Kuroki;Toshiaki Yamamoto
在来自使用扩散燃烧的内燃系统（例如煤或燃油锅炉、焚化炉或柴油发动机）的烟道排放物中，通常包括约10%的氧。单独使用催化剂或等离子体难以完全减少排放物中的NO/sub x/，因为部分NO/sub x/在富O/sub 2/-环境下被氧化。为了克服这些困难，我们提出了一种新的后处理系统的NO/sub x/包括在燃烧系统的废气中使用非热等离子体（NTP）解吸和还原。在该系统中，配备了可交换的吸附柱。首先，将包括NO/sub x/的废气吸附到NO/sub x/吸附剂上，持续时间为/spl Delta/t/sub a/。在/spl Delta/t/sub a/的时间段之后，利用一对旋转阀改变排气的路径，并且改变NO/sub x/吸附剂。吸附的NO/sub x/从吸附剂解吸，并通过使用N/sub 2/或低氧浓度气体施加NTP持续/spl Delta/t/sub d/的时间段来还原。通过吸附剂的交换，废气始终保持清洁。此外，因为NTP不应用于/spl Delta/t/sub a/，所以可以减少总电能。该系统可以在大气温度下操作，因为不使用催化剂。作为实现这类后处理系统的第一步，利用脉冲电晕NTP反应器对N/sub 2/ NTP脱附和NO/sub x/还原的基本特性进行了实验研究。在多次吸附/脱附过程之后，吸附的NO/sub x/的量变得等于脱附的NO/sub x/的量，即，所有的NO/sub x/在单个脱附过程中被脱附。证实了利用N/sub 2/ NTP解吸的NO/sub x/完全还原不仅对模拟废气是可能的，而且对真实的柴油机气体也是可能的。有效比能量密度可降至22 Wh/m/sup 3/。
In the flue emission from an internal combustion system using diffusing combustion such as coal or oil fuel boiler, incinerator, or diesel engine, around 10% oxygen is usually included. It is difficult to reduce the NO/sub x/ in the emission completely using catalysts or plasma alone because part of the NO/sub x/ is oxidized under an O/sub 2/-rich environment. In order to overcome these difficulties, we proposed a new after treatment system of NO/sub x/ included in the exhaust gas of the combustion system using nonthermal plasma (NTP) desorption and reduction. In this system, exchangeable adsorbent columns are equipped. First, the exhaust gas including NO/sub x/ is adsorbed to an NO/sub x/ adsorbent for a period of /spl Delta/t/sub a/. After the period of /spl Delta/t/sub a/, the path of the exhaust gas is changed with a pair of rotary valves and NO/sub x/ adsorbent is changed. The adsorbed NO/sub x/ is desorbed from the adsorbent and reduced by applying NTP for a period of /spl Delta/t/sub d/ using N/sub 2/ or low-oxygen-concentration gas. The exhaust gas is always kept clean by the exchange of adsorbent. Further, total electric energy can be reduced because NTP is not applied for /spl Delta/t/sub a/. This system can be operated at atmospheric temperature because no catalyst is used. As an initial step to realize such kind of after treatment system, the basic characteristics of the N/sub 2/ NTP desorption and NO/sub x/ reduction were examined experimentally using a pulse corona NTP reactor. After several adsorption/desorption processes, the amount of NO/sub x/ adsorbed becomes equal to that of the NO/sub x/ desorbed, that is, all the NO/sub x/ was desorbed in a single desorption process. It is confirmed that the NO/sub x/ complete reduction using N/sub 2/ NTP desorption is possible not only for a simulated exhaust gas but for a real diesel engine gas. The effective specific energy density can be decreased down to 22 Wh/m/sup 3/.