DBD Oxygen Plasma Reactor At Atmospheric Pressure Building Technology Research

Advanced oxidation technology to solve the problem of drinking water pollution is an effective way, the core is the preparation of hydroxyl radicals. Hydroxyl radical is a strong oxidant, oxidation-reduction potential is high, fast response, and the remaining hydroxyl rad-icals decomposed into oxygen and water, without any residue, which can effectively solve the drinking water treatment in the presence of various sources of pollution, clean a long time, secondary pollution and other problems. Although many ways to produce hydroxyl radicals, but most of the technical process complexity, and low concentrations of hydroxyl radicals generated problems, only to high concentrations of oxygen active particles (Reactive Oxygen Species, ROS, to oxygen meter)-led reaction pathway, the preparation of the hydroxyl radical concentration is high, the process is relatively simple, low cost, most can be realized. There-fore, it is possible to produce high concentrations of oxygen plasma reactor active particles prepared by hydroxyl radical is the most critical core components.This article relies on national863project (No.:2012AA062609), based on atmospheric electric discharge technology to flat dielectric barrier discharge (Dielectric Barrier Discharge, DBD) structure, based on high-purity aluminum oxide as the dielectric layer to build complete the R-10/20type atmospheric oxygen DBD plasma reactor modules, focused on solving the rectangular thin plate structures narrow gap discharge, local electric field enhancement, elec-trode corrosion and sealing, dielectric high-voltage electrode production and other key tech-nical issues; on this basis, established atmospheric oxygen DBD plasma reactor production of basic craft; explored R-10/20type atmospheric oxygen DBD plasma reactor characteristics, main results:A modular design pressure oxygen plasma flat-DBD reactor, and the performance of the modular reactor test, the test result is obtained:a single module of the reactor flow rate is higher than the concentration of100g/m33L/min, production in the flow of a concentration of54.2g/m39L/min achieved under29.26g/h, energy efficiency than13.01kWh/kg; Two modules in series the concentration of the reactor is higher than the flow rate of3L/min142.3g/m3, production in the flow of a concentration of91.8g/m39L/min reached49.57g/h, energy efficiency of less than11.89kWh/kg; three modules in series in the flow reactor, the concentration of3L/min release155.6g/m3, yields the flow rate of116.9g/m39L/min con-centration reached63.12g/h, energy efficiency is less than11.76kWh/kg. Optimize the grounding electrode material. Experimental Comparison of the5052alu-minum alloy, respectively,304and316L stainless steel reactor performance in the frequency of6kHz, the oxygen flow rate of3L/min, cooling water temperature of3.5℃be tested, the results show alloy reactor the concentration can reach115g/m3,304stainless steel reactor at a concentration of110.7g/m3,316L stainless steel reactor at a concentration of94.9g/m3. Discovered during experiments in anatomy metal grounding electrode surfaces are solid powdery product, tested by scanning electron microscopy analysis of the product are ground-ed electrode metal oxides. Comparing a strong ionization conditions found in the oxidation resistance of stainless steel is weaker than the5052aluminum alloy.After repeated exploration and research, forming a complete set of processing and as-sembly process for future large-scale production of atmospheric oxygen DBD plasma reactor foundation.