天津大学化工学院, 绿色合成与转化教育部重点实验室, 天津 300072
王保伟(1971—),男,博士,副教授,wangbw@tju.edu.cn
收稿:2019-09-23,
修回:2019-11-28,
网络首发:2020-08-14,
纸质出版:2020-02-05
移动端阅览
王保伟, 苏会娟, 姚淑美. O2介质阻挡放电微等离子体制备O3[J]. 化工学报, 2020, 71(2): 746-754 DOI: 10.11949/0438-1157.20191068.
WANG Baowei, SU Huijuan, YAO Shumei. Preparation of O3 by O2 DBD microplasma[J]. CIESC Journal, 2020, 71(2): 746-754 DOI: 10.11949/0438-1157.20191068.
介质阻挡放电(DBD)是工业生产臭氧(O
3
)最有效的方法。研究以O
2
为原料气采用DBD微等离子体放电制备O
3
,研究了放电间距、放电长度、放电功率以及停留时间对产生O
3
的影响。此外,通过向正弦AC等离子体电源中叠加调制脉冲,探讨了脉冲占空比与调制频率对O
3
生成的影响。结果表明:O
3
浓度与DBD反应器的放电间距呈负相关,与O
2
的停留时间呈正相关,放电功率及有效放电长度对O
3
浓度的影响呈现火山形变化趋势。综合考虑O
3
浓度及能量产率确定了适宜的参数。与普通正弦交流电源相比,在其基础上叠加脉冲调制电源有利于O
3
的产生,而能量产率与占空比呈正相关,与调制频率呈负相关,据此确定了合适的占空比与调制频率。
Dielectric barrier discharge (DBD) is considered to be the most efficient method for industrial production of ozone (O
3
). O
3
was prepared by using DBD microplasma discharge with O
2
as the raw material gas. The effects of the discharge interval
discharge length
discharge power and residence time on the production of O
3
were studied. In addition
the modulated pulse was added to the sinusoidal AC power supply
and studied the effect of pulse duty cycle and modulation frequency. The results showed that the concentration of O
3
decreased with the increase of discharge length
while the energy efficiency increased first and then decreased. At the discharge length of 0.75 mm
both were in a higher range. Excessive or too small discharge length was not conducive to
the formation of O
3
. The suitable discharge length was 80-90 mm. With the increase of discharge power
the concentration of O
3
rose first and then decreased
and the energy efficiency decreased almost linearly.The residence time of O
2
was positively correlated with the concentration of O
3
and negatively correlated with energy efficiency. The optimal discharge power was (6.7 ± 0.2) W
and the appropriate residence time was 1.0—1.4 s. It was found that the superposition of pulse modulation power supply on the basis of common sinusoidal alternating current is beneficial to the generation of O
3
and the energy efficiency decreased with the increase of the duty cycle
increased with the enhancement of the modulation frequency. The appropriate duty cycle and modulation frequency was 60%
800 Hz
respectively.
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