多针负电晕放电的甲醛净化试验

甲醛等挥发性有机物是室内空气污染物中对人体健康威胁极大的一类，长期暴露在甲醛环境中会降低人的机体功能，甚至引起癌变。电晕放电时会产生大量高能电子和活性粒子能够直接作用于空气中的有害物质，在净化甲醛方面具有极大的潜力。为了实现高效的甲醛净化效率，本文采用多针电极进行负极性直流电晕放电，研究其对甲醛的净化特性。研究发现增加电极针数能够提高总的电晕电流，加强放电能量，提高甲醛的净化效率。提高输入电压和减小间距均能提高甲醛的净化效率。同时，甲醛易溶于水，电极湿度会影响甲醛的去除效果，湿式状态下甲醛分解速率减缓，净化效率有所降低。

Experimental investigation on CH2O purification based on negative corona discharge of multi-needle electrode

Formaldehyde (CH2O) and other volatile organic compounds (VOCs) are one of the most dangerous indoor air pollutants to human health. Long-term exposure to formaldehyde will reduce human body functions and even cause cancer. Corona discharge will produce a large number of high-energy electrons and active particles, which can directly act on harmful substances in the air. It has great potential in purifying formaldehyde. In order to achieve high purification efficiency of formaldehyde, negative polarity DC corona discharge with multi-needle electrode was used to study the purification characteristics of formaldehyde. It is found that increasing the number of electrode needles can increase the total corona current, enhance the discharge energy and improve the purification efficiency of formaldehyde. The purification efficiency of formaldehyde can be improved by increasing the applied voltage and decreasing the spacing. At the same time, formaldehyde is easily soluble in water, and the electrode humidity will affect the removal effect of formaldehyde. In wet state, the decomposition rate of formaldehyde slows down, and the purification efficiency decreases.