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放电等离子体与催化剂共同作用的放电特性研究

A Preliminary Research on the Electric Characteristic in Discharge Plasma and Catalyst Act on Together

【作者】 蒋学

【导师】 李胜利;

【作者基本信息】 华中科技大学 , 环境工程, 2004, 硕士

【摘要】 本文首先设计了一种大功率脉冲高压电源,其电压、频率在0~30KV、0~10KHz范围内可以调节。同时在总结前人研究的基础上设计了一种新型介质板+γ—Al2O3小球的脉冲放电等离子体反应器,并对反应器的放电特性进行了研究,这些研究包括:介质板介电常数、电压频率、电压波型、及间隙距离对放电能量的影响规律,并拍摄了相应的放电图像。通过分析得出以下主要结论: 带介质板的反应器放电功率与介质板介电常数关系密切。在周期电压作用下对我们所研究的介质板介电常数范围,有如下规律: (1)Pmax(ε=8)> Pmax(ε=590)> Pmax(ε=3700)> Pmax(ε=14000)。(2)不同介质板介电常数,放电功率与电压频率有关,出现最高放电功率的电压频率随着介质板介电常数的减小而增加。当反应器在单极性定长脉冲作用下时,在我们研究的脉宽范围内: (1)随着脉冲宽度由几百纳秒增加到几千纳秒,放电能量增加,较强的放电出现在几个微秒。(2)在无介质板情况,放电能量明显低于有介质板情况,在脉冲宽度达到微秒级后,其也有所增加,但在间隙击穿前能达到的放电能量仍然较低,在本文研究的脉宽范围和介电常数范围内,ε=590反应器的放电能量始终较高。(3)输入电压脉宽越小,电极间隙距离对放电能量的影响越大,较小的间隙距离明显有利于放电能量的提高。

【Abstract】 At first, This paper designed a kind of high-voltage pulse power supply, The voltage, frequency could be regulated in 0-30KV, 0-10KHz ,At the same time , a new type of dielectric plate +γ—Al2O3 reactor on the basis of the theory has been improved. We study discharge characteristic of dielectric plate +γ—Al2O3 reactor ,including the influence of pulse voltage frequency , dielectric constants of dielectric plat , pulse voltage waveform , interval of discharge electrode on dielectric plate +γ—Al2O3 reactor discharge energy. The photo of discharge has been taken and the results were analyzed based on the data. The result shows: The maximum discharge energy(Pmax) of dielectric plate +γ—Al2O3 reactor largely relates with dielectric constant of dielectric plate, the disciplinarian is as follows: (1) Pmax(ε=8)> Pmax(ε=590) > Pmax(ε=3700) > Pmax(ε=14000). (2) Under different dielectric constants of dielectric plate, the discharge energy relates with voltage frequency. The less dielectric constants of dielectric plate, the larger the discharge energy. Under the single pole pulse (in the pulse duration range of paper study).The results following: (1) With the increasing of pulse duration from several hundreds to several ten hundreds nanosecond ,the discharge energy increase. (2) The discharge energy with dielectric plate is obviously larger than that without dielectric plate. In the pulse duration range of the paper, The maximum discharge energy occur when dielectric constant of plate is 590. (3) The shorter the pulse duration, The larger influence electrode interval on the discharge energy. The shorter electrode interval is more advantageous for increasing discharge energy.

  • 【分类号】X701.3
  • 【被引频次】3
  • 【下载频次】226
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