Multi-hollow surface dielectric barrier discharge: an ozone generator with flexible performance and supreme efficiency
Multi-hollow surface dielectric barrier discharge: an ozone generator with flexible performance and supreme efficiency
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DOI：
10.1088/1361-6595/aba987
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发表时间：
2020-09-01
影响因子：
3.8
通讯作者：
Simek, Milan
中科院分区：
文献类型：
--
作者：
Homola, Tomas;Prukner, Vaclav;Simek, Milan
本文研究了空气和氧气的占空比和流量对多空心表面介质阻挡放电（MSDBD）臭氧生成效率的影响。其公开了MSDBD中的臭氧生成效率与标准共面DBD、表面DBD和体积DBD相比显著更高。臭氧产量达到205.5 +/- 29.1 g（kW h）（-1）（40%占空比，8 slm）和413.91 +/- 58.7 g（kW h）（-1）（100%占空比，8 slm），合成空气和氧气的能量成本分别为8.7和4.3 eV/分子。如此高的臭氧产率源于MSDBD陶瓷的固有特性，MSDBD陶瓷通过工作气体的流动有效地冷却。低频5 kHz高压正弦波形的幅度调制有助于以几乎恒定的产率控制O（3）的产生。由于正确评估臭氧产量需要精确确定放电功率，臭氧浓度和工作气体流量，因此相当注意这些参数的测量。本文证实并实验证明，放电功率的正确确定取决于李萨如图形方法，而通过直接积分productu（t）i（t）来确定功率，其中i（t）由皮尔逊电流探针测量，导致计算功率的系统性较低值，从而高估臭氧产生量。放电功率的正确确定显然是正确计算臭氧产量和效率的关键。在本文提出的DBD放电条件下，臭氧产生产率和效率分别达到最近为空气和氧气建立的理论极限的19.5%和35.2%。
This contribution investigates the effects of duty cycle and mass flow of synthetic air and oxygen on the efficiency of ozone generation in multi-hollow surface dielectric barrier discharge (MSDBD). It discloses that the efficiency of ozone generation in MSDBD is significantly higher compared with standard coplanar DBD, surface DBD and volume DBDs. Ozone production yield reached 205.5 +/- 29.1 g (kW h)(-1)(40% duty cycle, 8 slm) and 413.91 +/- 58.7 g (kW h)(-1)(100% duty cycle, 8 slm) at an energy cost of 8.7 and 4.3 eV/molecule for synthetic air and oxygen, respectively. Such high ozone yields arose out of the intrinsic characteristics of MSDBD ceramics, which were efficiently cooled by the flow of the working gas. The amplitude modulation of low-frequency 5 kHz high-voltage sine waveforms facilitates controlled O(3)production at a nearly constant rate of yield. Since the correct evaluation of ozone production yield requires precise determination of the discharge power, the concentration of ozone and working gas-flow, considerable attention was paid to measurements of these parameters. It is confirmed and experimentally demonstrated herein that correct determination of discharge power lies with Lissajous figure methods, while the determination of power through the direct integration of productu(t)i(t), wherei(t) is measured by Pearson current probe, leads to systematically lower values of calculated power with consequent overestimation of the ozone production yield. The correct determination of discharge power is clearly the key to the proper calculation of ozone production yield and efficiency. Under the DBD discharge conditions presented herein, ozone production yield and efficiency achieved figures as high as 19.5% and 35.2% of theoretical limits recently established for air and oxygen, respectively.