Diagnostics of Atmospheric-Pressure Non-thermal plasmas for Air Polluion Control using Laser-induced Fluorescence Spectroscopy

使用激光诱导荧光光谱诊断用于空气污染控制的大气压非热等离子体

基本信息

批准号：
13650313
负责人：
KANAZAWA Seiji
金额：
$ 0.58万
依托单位：
Oita University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

Non-thermal plasma process has been considered to be an effective method to remove NOx from flue gas. In order to optimize the reactor and provide the information for numerical simulation of NOx removal, it is important to study directly the discharge induced plasma chemical processes responsible for NOx removal in the reactor. Laser-induced fluorescence (LIF) is a useful diagnostic method for in-situ observation of the phenomena during the NOx removal. The main objective of the presented work is visualization of two-dimensional NO concentration and monitoring the process of NOx removal inside the corona radical shower reactor. Planar laser induced fluorescence (PLIF) was employed for this purpose. The corona radical shower reactor consists of a nozzle-to-plate electrode system, having an electrode gap of 50mm. Stable dc streamer corona discharge was generated and laser pulses in the form of the sheet were shot between the electrodes during the discharge. LIF signal emitted at 90 degree to the laser sheet was imaged onto a gated ICCD camera and the two-dimensional LIF images from the various regions of the reactor were recorded. By the wide range imaging of NO (image size: 240mm in width and 160mm in height), two-dimensional distributions of NO could be observed not only the discharge zone but also both the downstream and the upstream regions of the reactor. In the present reactor at a low main gas flow rate, electrohydrodynamic (EHD) flow became dominant, and the flow towards the upstream affected the decrease of NO along the reactor from the upstream region. It is considered that this information is important for modeling and optimizing the plasma processes and designing the non-thermal plasma reactors.

非热等离子体工艺被认为是去除烟气中NOx的有效方法。为了优化反应器并为NOx去除的数值模拟提供信息，直接研究反应器中负责NOx去除的放电诱导等离子体化学过程非常重要。激光诱导荧光 (LIF) 是一种有用的诊断方法，可用于原位观察 NOx 去除过程中的现象。本工作的主要目标是二维 NO 浓度的可视化并监测电晕自由基簇射反应器内 NOx 去除的过程。平面激光诱导荧光（PLIF）用于此目的。电晕自由基簇射反应器由喷嘴到板电极系统组成，电极间隙为50mm。产生稳定的直流流光电晕放电，并且在放电期间在电极之间发射片状的激光脉冲。与激光片成 90 度发射的 LIF 信号被成像到门控 ICCD 相机上，并记录来自反应器各个区域的二维 LIF 图像。通过NO的大范围成像（图像尺寸：宽240mm，高160mm），不仅可以观察到排放区，还可以观察到反应器下游和上游区域的NO二维分布。在当前反应器中，在低主气体流速下，电流体动力（EHD）流成为主导，并且向上游的流影响了从上游区域沿着反应器的NO的减少。人们认为该信息对于等离子体过程的建模和优化以及非热等离子体反应器的设计非常重要。