共查询到17条相似文献,搜索用时 78 毫秒
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纳米二氧化钛协同放电等离子体降解甲苯的实验研究 总被引:1,自引:0,他引:1
在大气压、室温条件下,利用研制的气体喷射式线-筒放电反应器,实验研究了等离子体与二氧化钛(TiO2)协同降解实际空气流中甲苯的效果。结果表明:反应器中流场的分布对甲苯的降解率有显著影响,不同的电场与不同的流场匹配能产生不同的降解效果;正脉冲更有利于降解甲苯,放电电压为33 kV时,正脉冲比负脉冲对甲苯的降解率高出47.07%;二氧化钛与放电等离子体的协同明显强化了反应器的降解能力,甲苯初始浓度为400μL/L时,降解率高达94.74%;降解率随着电压的升高而升高,45 kV时,335μL/L甲苯气流的降解率达到94.63%;大电容放电比小电容放电更有利于降解甲苯,其优势随着电压的增长而增长。 相似文献
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低温等离子体催化降解甲醛的实验研究 总被引:10,自引:2,他引:10
为了消除甲醛对空气的污染,实验研究了低温等离子体与催化相结合的降解技术。气体放电产生的低温等离子体和紫外光为催化剂TiO2光催化作用提供激发能源,TiO2通过X射线衍射图与UV-vis表征,选定合适的TiO2后置负载于放电器的接地极板上。实验表明,在气体放电作用下甲醛降解迅速,降解率随它的初始质量浓度0ρ(CH2O)的变化有一峰值,0ρ(CH2O)过低和过高都不利于甲醛的去除;催化剂对甲醛降解有明显的促进作用,有TiO2薄膜时,甲醛去除率的峰值由73%提高到84%;电场强度是降解效率的主要决定因素,降解效率随着电场强度的增加而上升。 相似文献
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脉冲放电等离子体被广泛用于气态污染物处理的研究,放电参数直接影响反应器内等离子体状态,进而影响污染物的去除效果,研究不同条件下的放电特性可为脉冲等离子体技术的应用提供参考.本文利用线板式脉冲等离子体反应器, BPFN型高压脉冲电源供电, 研究了电源电容、极板间距及介质阻挡对放电特性的影响.结果表明:增大电源电容可以有效地提高电源能量效率;增大极板间距,峰值电压VP增大,峰值电流IP减小,脉宽减小,波形更加理想;陶瓷板阻挡放电可解决间隙火花放电,使脉冲电晕放电空间分布均匀,在大范围内提高电源能量效率. 相似文献
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放电等离子体臭氧发生技术的研究 总被引:2,自引:8,他引:2
臭氧作为解决今后环境问题的有用物质日益备受重视。为扩大臭氧在环境工作中的应用、臭氧发生技术的革新已成为当务之急,本文阐述了放电等离子体臭氧发生技术的研究现状及进展。 相似文献
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Development of discharge plasma waveguide with external magnetic field for laser plasma acceleration
Makito Osawa Yuki Kajiuchi Kyouhei Sawada Kazumasa Takahashi Toru Sasaki Takashi Kikuchi 《Electrical Engineering in Japan》2021,214(1):3-9
To improve the acceleration length in laser plasma acceleration, we investigate the discharge plasma waveguide with a magnetic field. The discharge circuit consists of two pulsed‐power circuits for preionization and main discharge. Discharges were repeated through the circuit using high‐power semiconductor switches. Laser propagation characteristics of discharge plasma waveguide with the external magnetic field were observed. The results show that the reproducibility of waveguide with the external magnetic field is relatively high compared to that without magnetic field. The laser intensity gradually decreases with the strength of external magnetic field. These results suggest that the electron density profile is possible to control using the discharge plasma waveguide with an external magnetic field. 相似文献
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阐述了负载型纳米TiO2光催化氧化NOx的机理,并设计了光催化氧化实验装置。采用超声波震荡将纳米TiO2均匀地镀在活性炭纤维、γ-Al2O3颗粒和石英砂颗粒上,制备了3种催化剂,从吸附、光解和氧化3个角度比较了3种催化剂的催化效果,然后考察了NO浓度、O2含量和含湿量等3个影响因素对NO转化率的影响。研究结果表明:NO浓度较低时,以活性炭纤维为载体的光催化剂,由于其较高的吸附能力和选择性催化氧化(SCO)特性,取得了较好的NO转化率;NO浓度较高时,以石英砂颗粒为载体的光催化剂,由于其较好的透光性,取得较好的NO转化率。 相似文献
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The exhaust gas from diesel engines is one of the major causes of air pollution. As one method for pollution control, the authors have been developing plasma reactors. The authors' reactor is a concentric cylinder type which has a glass tube barrier between electrodes. Connecting two of these reactors in series, the NOx (NO + NO2) component from diesel engine exhaust gas is decomposed up to 93%. This reactor was mounted on a 3-liter diesel engine and received six-mode load testing at an authorized public facility (JARI, Tsukuba City) and cleared the legal critical value of 350 ppm of NOx. By this success, the effectiveness of discharge plasma treatment of diesel exhaust gas and its practical evaluation have been confirmed. © 1997 Scripta Technica, Inc. Electr Eng Jpn, 120(2): 1–7, 1997 相似文献
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Toshifumi Yuji Kazunari Fujioka Shuitsu Fujii Hiroshi Akatsuka 《IEEJ Transactions on Electrical and Electronic Engineering》2007,2(4):473-475
To understand the mechanism of surface processing by atmospheric pressure nonequilibrium microwave discharge plasma jets of coaxial type without a resonator, we measured the vibrational and rotational temperatures in plasmas using optical emission spectroscopy. The plasma was excited by a microwave power supply, using a gas mixture of Ar and N2 as the plasma gas, and changing the flow rate of N2 gas. We also measured the change in the contact angle of a PET film before and after the plasma processing. It decreased as the plasma rotational temperature increased, indicating that the hydrophilicity of the PET surface was improved as the plasma rotational temperature became higher. © 2007 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. 相似文献