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Studies on ozone-zero phenomena in ozone generator and on its reliability progress

臭氧发生器零臭氧现象及其可靠性研究进展

基本信息

批准号：
20360128
负责人：
YAMABE Chobei
金额：
$ 7.65万
依托单位：
Saga University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2008
资助国家：
日本
起止时间：
2008 至 2010
项目状态：
已结题

项目摘要

[I. Needle-to-plate electrode system] : The needle-to-plate electrode system was used for the observation of the ozone-zero phenomena. Under the control of discharge in oxygen with the applied voltage of about 4.5 kV and the discharge current of about 1 μA, it took more than two and half months to prepare the condition for the experiments. At the first stage the ozone generation characteristics were generally the same of the conventional characteristics and gradually the characteristics were unstable before the appearance of the ozone-zero phenomena. After through these processes, relatively stable ozone-zero phenomena established in oxygen gas. After the appearance of ozone-zero phenomena, the addition effect of nitrogen gas on the ozone generation was confirmed.[II. Coaxial cylindrical type reactor with an inner rotating electrode] : Long time operation is very important for the industrial ozone production. The ozone concentration gradually decreased with time. One of the purposes of … More our experiments is to study what parameters (or reactions) decide this phenomena and how to control it. In this experiment, discharge was continued for eight hours each day and this operation was repeated about wo months. The ozone concentration was kept near the same level during experiments with a new electrode. The same surface condition of electrode was observed for few days and after that, the ozone concentration decreased dramatically due to some change of metal surface condition. The fluctuation of the ozone concentration between 7-0g/m3 was observed. These situations were observed few days and the ozone production stopped. After the zero ozone concentration was kept for about one hour, 10% nitrogen gas was added for 5 minutes. A few seconds after addition of nitrogen, the ozone concentration recovered again.During rotation of electrode, the discharge area became more uniformly. Different ozone production mode was observed with same input power. It seemed due to the change of the adsorbed layer of the metal surface. The ozone concentration seemed to be influenced on the metal surface condition and didn't stabilize during decreasing nitrogen density on the electrode surface. Nitrogen consumption increased with increasing of rotation speed and it looked about two times more at 600 rpm compared with no rotation. [III. Expanded mesh metal electrode type ozone generator (no ozone-zero phenomena observed here)] : We examined the method using an expanded metal electrode which was sandwiched between the di-electrodes sustained the electric discharge regardless of the fluctuation of supplied voltage and made the ozone generator more efficient. Less

[一.针对板电极系统]：针对板电极系统用于观测臭氧零点现象。在氧气中放电控制下，施加电压约4.5kV，放电电流约1 μA，经过两个半月的时间准备了实验条件。在第一阶段，臭氧产生特性基本上与常规特性相同，在出现臭氧零现象之前，臭氧产生特性逐渐不稳定。经过这些过程，在氧气中建立了相对稳定的臭氧零现象。在零臭氧现象出现后，证实了氮气的加入对臭氧产生的影响。[二.内旋转电极同轴圆筒型反应器]：长时间运行对工业臭氧生产非常重要。臭氧浓度随时间逐渐降低。的目的之一 ...更多信息我们的实验是研究什么参数（或反应）决定这种现象以及如何控制它.在这个实验中，每天持续放电8小时，重复这种操作约两个月.在使用新电极的实验期间，臭氧浓度保持在接近相同的水平。相同的电极表面状况观察了几天，之后，臭氧浓度急剧下降，由于金属表面状况的一些变化。臭氧浓度在7- 0 g/m ~ 3之间波动。这些情况观察了几天，臭氧生产停止。在零臭氧浓度保持约1小时后，加入10%氮气5分钟。充入氮气几秒钟后，臭氧浓度又恢复到原来的水平，在电极旋转过程中，放电区域变得更加均匀。在相同的输入功率下，观察到不同的臭氧产生模式。这似乎是由于金属表面吸附层的变化。臭氧浓度似乎受金属表面状态的影响，并且在降低电极表面氮浓度的过程中并不稳定。氮耗随转速的增加而增加，转速为600 rpm时的氮耗是不旋转时的2倍左右。[三.膨胀网金属电极型臭氧发生器（这里没有观察到臭氧零现象）]：我们研究了使用夹在介电电极之间的膨胀金属电极的方法，该电极维持放电而不管供应电压的波动，并使臭氧发生器更有效。少