Mercury oxidization in dielectric barrier discharge plasma system
Mercury oxidization in dielectric barrier discharge plasma system
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DOI：
10.1021/ie0603666
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发表时间：
2006-08-16
影响因子：
4.2
通讯作者：
Mathur, V. K.
中科院分区：
文献类型：
--
作者：
Chen, Zongyuan;Mannava, Deenal P.;Mathur, V. K.
元素汞（Hg-0）及其某些化合物具有明显的挥发性，再加上其极强的毒性，使得这些物质极其危险。将Hg-0转化为HgO将大大提高烟道气中汞的去除率。本调查的重点是研究的一些成分，如O-2，H2O，CO2，和NOx存在于烟气中的元素汞氧化在介质阻挡放电（DBD）反应器的效果。结果表明，在能量密度高达114 J/L的条件下，在0.1%O2和N2的混合气体中，Hg蒸气（6ppbv）被有效氧化。当存在于8%O-2、2%H2O和10%CO2的气体混合物中时，可实现超过80%的汞转化。NOx的存在增强了DBD反应器中的汞氧化。氧化化学进行了讨论。研究表明，在DBD反应器和湿式洗涤器系统中，汞可以与其他两种主要污染物NOx和SO2同时沿着去除。这就避免了从燃煤电厂中去除主要气体污染物的三种技术的需要。
The pronounced volatility of elemental mercury (Hg-0) and some of its compounds, coupled with their extreme toxicity, makes these substances extremely hazardous. Conversion of Hg-0 to HgO would significantly enhance mercury removal from flue gases. This investigation is focused on studying the effect of some of the constituents such as O-2, H2O, CO2, and NOx present in flue gases on elemental mercury oxidation in a dielectric barrier discharge (DBD) reactor. The results show that Hg vapors (6 ppbv) in a stream of 0.1% O-2 and N-2 are effectively oxidized at the energy density of up to 114 J/L. Hg conversion of over 80% is achieved when present in a gas mixture of 8% O-2, 2% H2O, and 10% CO2 in N-2 balance. The presence of NOx enhanced mercury oxidation in the DBD reactor. The oxidation chemistry is discussed. Studies show that Hg can be simultaneously removed along with the other two major pollutants, NOx and SO2, in one DBD reactor followed by a wet scrubber system. This avoids the need of three techniques for the removal of major gaseous pollutants from coal-fired power plants.