纳秒脉冲液相放电耦合微气泡固氮影响因素分析

doi:10.19595/j.cnki.1000-6753.tces.221939

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摘要

由气液等离子体放电产生的活化水富含活性氧和活性氮（NO₂^-、NO₃^-、H₂O₂、O₃等）,在环境治理、材料合成和医疗卫生等领域有着广泛的应用前景。该文提出了一种“多微孔-同轴式”的微气泡等离子体放电结构,微孔和微气泡的引入降低了在液相中的击穿场强,并且微气泡增加了气液界面的化学反应和活性物质的溶解。以空气为放电气体,主要探究了正、负极性脉冲参数对活化水固氮特性的影响。此外,还考察了气体流速、温度等对活化水中的氮特性的影响,并诊断了电学特性。结果表明,正极性放电下NO₂^-产量和NO₃^-产量分别为7.2 mg、28.8 mg,相比负极性放电分别高出0.3 mg、4.2 mg,经计算正极性放电能量效率高达15.02 g/(kW·h)。同时研究发现,气流流速在2 L/min时,固氮性能最佳。水温越高,氮含量会随着液相分解动力学温度的降低而减弱。

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关键词 ：纳秒脉冲放电, 微气泡, 等离子体, 固氮

Abstract：

Plasma-activated water produced by gas-liquid plasma discharge is rich in reactive oxygen species and reactive nitrogen, and it has a wide application prospect in the fields of environmental treatment, material synthesis, and medical health. However, how quickly preparing large volumes and high concentrations of activated water of RNOS is still a difficult problem, and the design of a gas-liquid plasma reactor is one of the key factors to solve this problem. In order to solve these problems, this paper designed a "multi-microporous coaxial" microbubble plasma reactor, which uses multi-microporous microbubbles to reduce the breakdown field strength of the liquid phase, and forms multi-spark discharge channels in the liquid phase, so that rich active oxygen and nitrogen can be generated in the liquid phase. Under the excitation of nanosecond pulses, the factors influencing the nitrogen fixation of microbubbles by coupling nanosecond pulse liquid discharge in a microbubble plasma reactor were investigated.
Firstly, this paper explored the influence of positive and negative pulse parameters on the nitrogen fixation characteristics of activated water. The results showed that the output of NO₂^-and NO₃^- under positive discharge was 7.2 mg and 28.8 mg respectively. Because of the voltage polarity effect and the different development of positive and negative currents, the output of NO₂^-and NO₃^- were 0.3 mg and 4.2 mg higher than that of negative discharge, respectively. The energy efficiency of positive discharge was calculated to be 15.02 g/(kW?h). At the same time, it was found that the airflow rate affected the nitrogen fixation efficiency, and the best flow rate for nitrogen fixation performance was 2 L/min. In addition, nitrogen fixation efficiency is also affected by water temperature. In this paper, the lower the water temperature is, the higher the nitrogen fixation efficiency is. Because the solubility of oxygen and other gases will decrease with the increase in temperature, affecting the process of N₂ and O₂ discharging to generate NO_x. Secondly, this paper measured the plasma emission spectrum during discharge, analyzed the physical and chemical reactions at the gas-liquid interface according to spectral characteristics, and deduced the reaction path of nitrogen and oxygen. The physical and chemical characteristics of activated water during the discharge were investigated. It was known that the generation of active substances in the gas and liquid phases was also an accumulation process. The liquid phase spark discharge produced a large number of active particles to dissolve the water, resulting in a decrease in the pH of the solution, an increase in ORP, and an increase in conductivity. The water temperature rises about 5℃ due to the "hydroelectric effect". Finally, the analysis of electrical characteristics showed that microbubbles and micropores distort the electric field in the liquid phase, making the liquid phase discharge more likely to occur.
The following conclusions can be drawn from the analysis: (1) The microbubble coupled plasma discharge device is designed, which can continuously generate microbubbles and reduce the breakdown field strength; and it can also reduce the loss of metal electrodes and discharge in the liquid with high conductivity, forming a multi-electrode spark discharge channel. (2) The nitrogen fixation efficiency of positive discharge is higher than that of negative discharge. The main reason is that the voltage polarity effect is different from the development of positive and negative currents. (3) The nitrogen fixation efficiency of the activated water increases with time, but it is lost in the form of heat energy due to the polarity effect during discharge. Setting a lower water temperature can reduce the energy loss due to heat during discharge, and the number of active particles generated is higher. This paper provides a new way for the nitrogen fixation model.

Key words： Nanosecond pulsed discharge microbubbles plasma nitrogen fixation

收稿日期: 2022-10-09

PACS:

TM215

基金资助:

国家自然科学基金项目（52022096）和英国皇家学会牛顿高级学者项目（NAF\R2\192117）资助

通讯作者: 章程男,1982年生,博士,研究员,研究方向为高电压与等离子体技术。E-mail：zhangcheng@mail.iee.ac.cn

作者简介: 邝勇男,1997年生,硕士研究生,研究方向为放电等离子体。E-mail：kuangyong@mail.iee.ac.cn

引用本文:

邝勇, 章程, 胡修翠, 任晨华, 陈根永, 邵涛. 纳秒脉冲液相放电耦合微气泡固氮影响因素分析[J]. 电工技术学报, 0, (): 107-107. Kuang Yong, Zhang Cheng, Hu Xiucui, Ren Chenhua, Chen Genyong, Shao Tao. Factors Influencing Nitrogen Fixation by Microbubbles Coupled with Nanosecond-pulse Liquid Phase Discharges. Transactions of China Electrotechnical Society, 0, (): 107-107.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.221939 https://dgjsxb.ces-transaction.com/CN/Y0/V/I/107

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