摘要
随着现代工业的发展,人类活动的不断扩大以及社会对环境的忽视,造成了越来越严重的环境污染问题。水体中的大量污染物严重威胁着人类自身的健康。低温等离子体液相氧化技术作为一项新开发的污水处理技术,具有能耗低、效率高,快捷简便的特点,本电源就是为了探索适合我国国情的经济有效的工业化治理途径而研制的。
本文通过对现今各种污水处理技术的比较,说明脉冲电晕法作为一种新兴的污水处理技术,具有良好应用前景。但由于现有脉冲电晕法等离子体电源设备的缺点,只停留在实验室阶段不能大规模的工业化实践应用,故根据脉冲电晕法现有的实验规律和脉冲电源的缺点,设计了一种新型的高频高压交直流叠加等离子体电源。该电源采用固态开关代替原有的火花隙开关并采用高频交直流叠加技术,使脉冲电晕等离子体技术可望推广到工业化实践应用阶段。
电源采用交直流电源叠加的方式,交直流叠加可以产生稳定、宽范围和有效的流光。交流电压使放电增强,单脉冲注入能量增大,产生自由基增多,因而氧化降解量增加。直流基压驱使阳离子和电子离开流光通道,在更大的范围内发生复合反应,自由基分布更广,与污染物等接触增加,因而处理效果增强。
电源交流部分采用串联负载串联谐振的工作方式,电源直流部分采用并联负载串联谐振的工作方式。在谐振升压的同时可以实现逆变电路开关管的零电流关断,减少开关损耗和散热器的体积。同时串联电感的应用使电源可以可靠的工作在负载频繁放电的条件下。
通过在校内中型试验平台上的实验表明,该电源工作稳定,能够产生有效稳定的流光,具有很强的氧化效果,特别是在加入催化剂的条件下,起到显著的污水净化效果。
With the development of modern industry, expanding of human's movements and ignorance of the society, the environment pollution become more and more serious. There are plenty of pollutants in raw water, which seriously threaten human health. As a new wastewater treatment technology, non-thermal plasma induced aqueous oxidation is low cost, high efficiency, celerity and convenience. The aim that researched is to find a feasible, effective and economic technique use in the industry.
In this dissertation, through the comparison of several wastewater treatment methods, streamer-discharging is novel technique and have a good application foreground. As a result of the shortcomings of the current power supply, these could only use in the laboratory and could not apply in the industry. On the base of the lab theories of streamer-discharging and the shortcomings of those power supply, a novel high frequency and high voltage power supply is designed. This power supply uses the solid-state switch to take place the spark-gap switch and the AC+DC technique. These new techniques adopted in the wastewater treatment power supply can make streamer-discharging have a good expect to extend in the industry.
The AC power supply adopts the mode of series load series resonant. The DC power supply adopts the mode of parallel load series resonant. Using the resonant technique can realize ZCS and decrease switching loss. At the same time the series inductance can make the power supply work normally under the condition of frequent discharging in the reactor.
The output of the power supply is the AC supposed on the DC in order to produce effective and steady streamer at a broad range. AC makes the discharging stronger and increases the energy density and free radical quantity in the reactor. DC spreads cationic and free radical to a broad range and increases the chance of degradation and oxidation in reaction.
Through the experiment, the power supply work steady and produce effective streamer. Under the condition of adding catalyst into the reactor, the effect of treatment is remarkable.
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