针阵列电晕放电降低室内苯实验研究
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摘要
苯污染是室内空气污染物中一个重要部分,具有微量、易挥发、高毒性等特点。现有的降低苯污染技术包括吸附净化法、吸收法、燃烧法、生物净化法、光催化氧化法等,这些方法仅对工业废气或高浓度苯废气具有明显效果。室内空气苯具有浓度低、处理空间大等特点。因此,一种处理低浓度、大空间污染气体方法成为目前研究重点。本论文在结合实验室前期非热放电净化室内空气研究的基础上,采用多种针阵列电晕放电方式,建立高效的净化室内空气中苯污染的实验装置。
本文首先采用针阵列对板正电晕放电进行降低苯污染的实验研究。分别研究了三种初始浓度下的空白实验,通过改变初始浓度、风速、放电功率和相对湿度,探讨各参数对苯去除率的影响。
随后,改变高压电源极性,研究针阵列对板负电晕放电中,初始浓度、放电功率、和相对湿度对苯去除率的影响。
最后,采用针阵列双极电晕放电技术,研究正、负高压供电时针阵列双极电晕放电对苯的去除效果,并与针阵列对板电晕放电对苯的去除效果作出比较,从而筛选出降低苯的最佳放电方式和放电参数。
通过比较实验结果并结合理论分析,筛选出去除室内空气中苯的最优放电方式是针阵列对板正电晕放电方式,具体运行参数为风速采用2.4m/s,放电功率为9W,室内空气湿度为40%。
Benzene pollutant is an important part of the indoor air pollutants. It is characterized by micro-scale, highly toxic, and volatility. Current technologies consist of adsorption purification method, absorption method, combustion method, biological purification method, photo catalytic oxidation method and etc. These methods only apply to control industrial emissions or high concentrations of benzene. However, indoor air benzene pollutant is low concentrations in large spaces. So how to treat benzene pollutant with low concentration in a large space becomes an important research. In this thesis, based on the early research in indoor air cleaning using non-thermal discharge, the needle-matrix corona discharges are used to reduce indoor benzene pollutant. An experimental device for efficient purification of benzene in indoor air is established.
Firstly, the needle-matrix to plate positive corona discharge is used to remove benzene pollutant. The blank experiment of three kinds of initial concentrations is studied. By changing initial concentration of benzene, wind velocity, discharge power and relative humidity, the effects of each parameter on benzene removal rate is studied.
Then, using the needle-matrix plate negative corona discharge, the effect of various parameters including initial concentration of benzene, discharge power and relative humidity on benzene removal rate is studied.
At last, using the needle-matrix bipolar corona discharge, the effect of discharge power on benzene removal rate is studied. By comparing all these methods for benzene removal, the best kind of discharges and the optimal discharge parameters are obtained.
By comparing the experimental results and combining with theoretical analysis, it is including that the best discharge is the needle-matrix to plate positive corona discharge. And the optimal discharge parameters are as follows:the wind velocity is 2.4m/s, the discharge power is 9W, and the relative humidity is 40%.
本文首先采用针阵列对板正电晕放电进行降低苯污染的实验研究。分别研究了三种初始浓度下的空白实验,通过改变初始浓度、风速、放电功率和相对湿度,探讨各参数对苯去除率的影响。
随后,改变高压电源极性,研究针阵列对板负电晕放电中,初始浓度、放电功率、和相对湿度对苯去除率的影响。
最后,采用针阵列双极电晕放电技术,研究正、负高压供电时针阵列双极电晕放电对苯的去除效果,并与针阵列对板电晕放电对苯的去除效果作出比较,从而筛选出降低苯的最佳放电方式和放电参数。
通过比较实验结果并结合理论分析,筛选出去除室内空气中苯的最优放电方式是针阵列对板正电晕放电方式,具体运行参数为风速采用2.4m/s,放电功率为9W,室内空气湿度为40%。
Benzene pollutant is an important part of the indoor air pollutants. It is characterized by micro-scale, highly toxic, and volatility. Current technologies consist of adsorption purification method, absorption method, combustion method, biological purification method, photo catalytic oxidation method and etc. These methods only apply to control industrial emissions or high concentrations of benzene. However, indoor air benzene pollutant is low concentrations in large spaces. So how to treat benzene pollutant with low concentration in a large space becomes an important research. In this thesis, based on the early research in indoor air cleaning using non-thermal discharge, the needle-matrix corona discharges are used to reduce indoor benzene pollutant. An experimental device for efficient purification of benzene in indoor air is established.
Firstly, the needle-matrix to plate positive corona discharge is used to remove benzene pollutant. The blank experiment of three kinds of initial concentrations is studied. By changing initial concentration of benzene, wind velocity, discharge power and relative humidity, the effects of each parameter on benzene removal rate is studied.
Then, using the needle-matrix plate negative corona discharge, the effect of various parameters including initial concentration of benzene, discharge power and relative humidity on benzene removal rate is studied.
At last, using the needle-matrix bipolar corona discharge, the effect of discharge power on benzene removal rate is studied. By comparing all these methods for benzene removal, the best kind of discharges and the optimal discharge parameters are obtained.
By comparing the experimental results and combining with theoretical analysis, it is including that the best discharge is the needle-matrix to plate positive corona discharge. And the optimal discharge parameters are as follows:the wind velocity is 2.4m/s, the discharge power is 9W, and the relative humidity is 40%.
引文
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[10]谢海英,陈康民.室外空气污染对室内空气质量的影响研究.环境科学研究,2008,21(2)：73-78.
[11]高书霞.物理性污染的危害及防治方法.物理通报,2004,3：6-48.
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[13]刘洪涛,晁福寰.室内空气物理性因素污染研究.中国预防医学杂志,2002,3(3)：170-173.
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