DEVELOPMENT OF COMPACT EXHUST GAS TREATMENT EQUIPMENT FOR DIESEL ENGINE USING DIELECTRIC BARRIER DISCHARGE

紧凑型介质阻挡放电柴油机废气处理装置的研制

• 批准号: 09555084
• 负责人: FUJIWARA Tamiya
• 金额: $ 5.63万
• 依托单位: IWATE UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09555084/
• 关键词: FLUE GAS TREATMENT; Nox REMOVAL; BARRIER DISCHARGE; SILENT DISCHARGE; NON-EQUILIBRIUM PLASMA; LOW TEMPARETURE PLASMA; PLASMA CHEMISTRY; AIR POLLUTANT CONTROL; NOx処理; 非平衡プラズマ

The purpose of this project is to realize a compact system of NOx removal from exhaust gas of diesel engine generator with high efficiency. The project was performed in the following three steps. (1) The first step is to grasp the characteristics of a barrier discharge plasma reactor with a multipoint-to-plane geometry and clarify physical and chemical reactions in the plasma. (2) The second step is to develop a power supply for the plasma reactor. (3) The third is the outlook for practical application of the reactor. In the step(1), we investigated mainly the characteristics of the dielectric barrier discharge between the multipoint and plane electrodes, and an effect of them on the NOx removal. The results are as follows.In regard to the polarity of the streamer, it was clarified that the positive and negative streamers both are generated according to the polarity of applied voltage in the case of the multipoint-to-plane barrier discharge while the positive streamer only is generated … More in the case of the parallel planes barrier discharge. And the current of the micro-discharge is larger between the parallel plane electrodes than the multipoint-to-plane electrodes. In comparison of the gas treatment performance, the NOx removal of the multipoint-to-plane discharge was larger than that of the parallel planes discharge. Concerning the step (2), we did a trial production of a pulse modulator which is composed the IGBT and a pulse transformer. The specification is AC100V in rated primary voltage, 【minus-plus】10kV in secondary output voltage and 2500pps in reputation rate of pulses. With respect to the step (3), an experiment of actual operation was carried out using a diesel engine generator with the rating of 20kVA. An exhaust gas from the generator was flowed into the plasma reactor through a ceramic catalyst and a particle filter. The reactor was made only of a metal, a ceramic and a glass with heat-resistance. A double-walled structure was designed so that it prevents the wall surface from condensing due to wall temperature drop. By this structure, it was confirmed that NOx could be reduced in long time operation of about 12 hours. The filter is maintained by exposing to atmosphere of high temperature and burning out the deposits in about one month. The NOx removal is 35ppm and is corresponding to 10% reduction for the concentration (about 3 50ppm) in the full load. Gas flow rate and input energy are 1.2's mィイD13ィエD1/min. and 9 J/L, respectively. Less

本课题旨在实现一套高效、紧凑的柴油发电机组尾气NOx脱除系统。该项目分以下三个步骤执行。(1)第一步是掌握具有多点平面几何结构的阻挡放电等离子体反应器的特性，明确等离子体中的物理化学反应。(2)第二步是为等离子体反应器开发电源。(3)第三部分是对反应器实际应用的展望。在步骤(1)中，我们主要研究了多点电极和平面电极之间的介质阻挡放电特性，以及它们对NOx脱除的影响。结果如下：关于流光的极性，澄清了在多点对平面阻挡放电的情况下，正流光和负流光都是根据外加电压的极性产生的，而在平行平面阻挡放电的情况下，只产生正流光。平行平面电极间的微放电电流大于多点对平面电极间的微放电电流。在气体处理性能对比中，多点对平面放电的NOx去除率大于平行平面放电。在步骤(2)中，我们试制了由IGBT和脉冲变压器组成的脉冲调制器。额定一次电压为AC100V，二次输出电压为【±】10kV，脉冲名誉率为2500pps。对于步骤(3)，使用额定功率为20kVA的柴油机发电机进行了实际运行实验。发生器排出的废气通过陶瓷催化剂和颗粒过滤器流入等离子体反应器。该反应堆仅由金属、陶瓷和耐热玻璃制成。设计了双壁结构，以防止壁面因壁面温度下降而凝结。通过这种结构，证实了在12小时左右的长时间运行下可以减少NOx。将过滤器暴露在高温大气中，并在一个月左右的时间内燃烧掉沉积物。NOx去除率为35ppm，相当于满负荷时NOx浓度（约350ppm）降低10%。气体流速和输入能量为1.2 μ m /min。和9 J/L。少

项目成果

Muaffaq A. Jani, K. Takaki, T. Fujiwara: "Streamer polarity dependence of Nox removal by dielectric barrier discharge with a multipoint-to-plane geometry"Journal of Physics D: Applied Physics. Vol.32, No.19. 2560-2567 (1999)

Muaffaq A. Jani、K. Takaki、T. Fujiwara：“采用多点到平面几何形状的介质阻挡放电去除氮氧化物的流光极性依赖性”物理学杂志 D：应用物理学。

K. Takaki, Muaffaq A. Jani, T. Fujiwara: "Removal of Nitric Oxide in Flue Gases by Multipoint to Plane Dielectric Barrier Discharge"IEEE Transaction on Plasma Science. Vol.27, No.4. 1137-1145 (1999)

K. Takaki、Muaffaq A. Jani、T. Fujiwara：“通过多点到平面介质阻挡放电去除烟气中的一氧化氮”IEEE 等离子体科学汇刊。

T. Suzuki, H. Murakami, K. Takaki, T. Fujiwara: "Reduction of N02 in Simulated Gas Using Dielectric Barrier Discharge"Institute of Electrical Engineering Japan. 117A, 11. 1084-1089 (1997)

T. Suzuki、H. Murakami、K. Takaki、T. Fujiwara：“利用介质阻挡放电减少模拟气体中的 N02”，日本电气工程学会。

Koichi Takaki: "Experimental Study on Heat Flux from an Argon Rf Plasma Using Laser Interferometry Method" Japanese Journal of Applied Physics. 37・6A. 3514-3520 (1998)

Koichi Takaki：“使用激光干涉测量法对氩 Rf 等离子体的热通量进行实验研究”，日本应用物理学杂志 37・6A 3514-3520（1998 年）。

Muaffaq A. Jani, K. Takaki, T. Fujiwara: "Low-voltage operation of a plasma reactor for exhaust gas treatment by dielectric barrier discharge"Review of Scientific Instruments. Vol.69, No.4. 1847-1849 (1998)

Muaffaq A. Jani、K. Takaki、T. Fujiwara：“通过介质阻挡放电处理废气的等离子反应器的低压操作”科学仪器评论。