SO_2,NO 等离子体净化中自由基行为的分析

A Study on the Behavior of Free Radicals in the Purification of SO 2 and NO under Plasmoid

建立一个简单而合理的化学反应模型，对等离子体条件下活性自由基在ＳＯ２和ＮＯ净化中的行为和作用进行化学动力学分析．结果表明，ＯＨ，Ｏ和ＨＯ２基在ＳＯ２和ＮＯ气相氧化脱除中起主导作用，在整个净化机制中，气相反应的贡献仅占２０％左右；气溶胶表面的催化作用加强了ＳＯ２和ＮＯ的氧化速度，异相反应对ＳＯ２和ＮＯ净化有重要贡献，一个气溶胶可提供１０７ｃｍ－３的自由基．动力学模拟结果与实验结果定性相符．

Based on a simplified but rational chemical reaction model, a chemical kinetic analysis on the behavior and role of active free radicals in the course of the purification of SO 2 and NO from flue gas under the condition of pulsed corona plasma has been made. It is shown that the radicals OH, O and HO 2 are primarily responsible for de SO 2 and de NO in gaseous oxidation. The gaseous phase reactions contribute only about 20 % to the entire purification mechanism. The heterogeneous reactions play an important role in the SO 2 and NO purification, in the manner that the catalytic action on the surface of the aerosol intensifies the rate of SO 2 and NO oxidation as one aerosol provides 10 7 cm -3 of OH radicals. Theoretical results quantitatively agree with those obtained by typical experiments.