检索结果-南通市图书馆

Improvement in discharge characteristics and energy yield of ozone generation via configuration optimization of a coaxial dielectric barrier discharge reactor

在线全文

学校读者我要写书评

暂无评论

中国化学工程学报:英文版 2023年第8期60卷 61-68页

作者： Chuang Liang Zhihao Liu Baochang Sun Haikui Zou Guangwen Chu State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Research Center of the Ministry of Education for High Gravity Engineering and Technology Beijing University of Chemical TechnologyBeijing 100029China

Dielectric barrier discharge (DBD) has been widely employed in ozone ***,the technology still exhibits relatively low energy yield (E_(Y)) referring to its theoretical *** this work,E_(Y)of ozone generation was improved by optimizing the mesh number,electrode length,and dielectric material in a coaxial DBD reactor with two wire mesh ***,the discharge characteristics were investigated to elucidate the effect of reactor configuration on E_(Y).Results showed that the discharge characteristics were improved by increasing the mesh number,electrode length,and relative *** the mesh number was increased from 40 to 100,an improvement of approximately 48%in E_(Y) was ***,higher E_(Y) values were obtained using corundum as the dielectric material relative to polytetrafluoroethylene and ***,E_(Y) in the optimal DBD reactor could reach 326.77 g·(k W·h)^(-1).Compared with the reported DBD reactor,the coaxial DBD reactor with the mesh electrode and the dielectric material of corundum could effectively improve E_(Y),which lays a foundation for the design of high-efficiency coaxial DBD reactor.

关键词： Coaxial DBD reactor Configuration optimization ozone generation Discharge characteristics Energy yield

Numerical investigation on the effect of gas parameters on ozone generation in pulsed dielectric barrier discharge

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2018年第12期20卷 107-116页

作者： Linsheng WEI Xin LIANG Yafang ZHANG School of Resources Environmental ＆ Chemical Engineering Nanchang UniversityNanchang 33003 lPeople＇s Republic of China

Pulsed dielectric barrier discharge is a promising technology for ozone generation and is drawing increasing interest. To overcome the drawback of experimental investigation, a kinetic model is applied to numerically investigate the effect of gas parameters including inlet gas temperature, gas pressure, and gas flow rate on ozone generation using pulsed dielectric barrier discharge. The results show that ozone concentration and ozone yield increase with decreasing inlet gas temperature, gas pressure, and gas flow rate. The highest ozone concentration and ozone yield in oxygen are about 1.8 and 2.5 times higher than those in air, respectively. A very interesting phenomenon is observed： the peak ozone yield occurs at a lower ozone concentration when the inlet gas temperature and gas pressure are higher because of the increasing average gas temperature in the discharge gap as well as the decreasing reduced electric field and electron density in the microdischarge channel. Furthermore, the sensitivity and rate of production analysis based on the specific input energy （SIE） for the four most important species 03, O, O（1D）, and O2（b1∑） are executed to quantitatively understand the effects of every reaction on them, and to determine the contribution of individual reactions to their net production or destruction rates. A reasonable increase in SIE is beneficial to ozone generation. However, excessively high S1E is not favorable for ozone production.

关键词： ozone generation gas parameters sensitivity analysis rate of production analysis pulsed dielectric barrier discharge

Effect of megapore particles packing on dielectric barrier discharge,O_(3) generation and benzene degradation

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2022年第1期24卷 86-94页

作者： Kefeng SHANG Wudi CAO Weiwei HUAN Nan JIANG Na LU Jie LI School of Electrical Engineering Dalian University of TechnologyDalian 116024People's Republic of China School of Environmental Science and Technology Dalian University of TechnologyDalian 116024People’s Republic of China

Recently,packed-bed discharge plasma technologies have been widely studied for treatment of volatile organic compounds(VOCs),due to the good performance in improving the degradation and mineralization of *** this paper,a coaxial cylindrical dielectric barrier discharge reactor packed with porous material of micron-sized pores was used for degradation of benzene,and the discharge characteristics and ozone generation characteristics were *** the discharge length was 12 cm and the filling length was 5 cm,the packed particles in the discharge area significantly increased the number of micro-discharges,and the current amplitude and density increased with the pore size of packed particles,but the discharge power and ozone concentration showed a trend of first increasing and then *** discharge power and ozone production reached the maximum when the size of pore former was 75μm,correspondingly,the degradation efficiency of benzene was the highest.

关键词： plasma packed bed dielectric barrier discharge micro-discharge ozone generation benzene degradation

Influence of ozone on the rheological and electrical properties of stored human blood

在线全文

学校读者我要写书评

暂无评论

The Journal of Biomedical Research 2012年第3期26卷 185-192页

作者： Hoda El-Saied Abdel Baieth Islam Shoukri Elashmawi Department of Physics Faculty of ScienceBenha UniversityBenha 13518Egypt Department of Physics Faculty of ScienceTaibah UniversityAl-Ula 100823Saudia Arabia Department of Spectroscopy Physics DivisionNational Research CenterGiza 12311Egypt

Blood stored in a blood bank undergoes a series of chemical changes and storage lesions. The purpose of this study was to assess the effect of ozone on the rheological and electrical properties of stored human blood. Venous blood samples, obtained from three healthy humans, were treated with different concentrations of ozone （30, 50, 70 and 80 ~tg/mL） for three weeks in vitro. ozone was generated from portable medical-grade oxygen using elec- trical corona arc discharge. The ultraviolet-visible absorption of hemoglobin in the wavelength of 300-700 nm showed that ozone in this range did not interact with iron ions and it was not toxic below the concentration of 80 ~tg/mL. The changes of blood viscosity were also measured. The electrical conductivity and permittivity, in the frequency range from 5 to 50 MHz, were measured in the control and treated samples subjected to different concentrations of ozone at different stored periods. The results showed that the conductivity and permittivity measurements may serve as a useful indicator in the quality assessment of blood samples stored in the blood bank.

关键词： blood ozone generation alternate current conductivity viscosity