Development of hybrid type of removal equipment for VOC(Volatile Organic Compound)by diffusion scrubber method

近年来，建筑材料、胶粘剂、汽油、汽车尾气排放的挥发性有机化合物（VOCs）已成为大气污染和室内空气污染的严重问题。采用扩散洗涤器法研制了空气中挥发性有机物（VOCs）的去除和处理设备。该设备由ACF（活性炭纤维）片材的平行板式扩散洗涤器组成。它可以通过将被污染的空气流入两个平行ACF板之间的狭窄空间来去除挥发性有机化合物。与传统的“过滤”空气净化方法相比，“扩散洗涤器法”使污染空气在平行板之间狭窄的空间内流动，通气阻力小。因此，扩散洗涤器法由于曝气阻力小，可以处理大量的污染空气。该清除设备由一个简单的结构组成，该结构将两个ACF片的基本单元设置为410层。在两个ACF板之间，为了通过空气，在两个ACF板之间插入垫片，间距为0.07mm。将400 ~ 500ppbv的VOCs气体（苯、甲苯、乙苯、对二甲苯、三氯乙烯、四氯乙烯）以600m^3/h的风量引入去除装置。评价实验结果表明，该设备对VOCs的去除率在90%以上。在空气流量为1200m^3/h时，对VOCs的去除率高达80%。然后，发现去除设备的去除效率与由Gormley-Kennedy方程计算的理论值一致。本研究还将扩散洗涤法与二氧化钛（TiO_2）的光催化作用相结合，开发了HCHO的去除设备，达到了高去除效率和低能耗的目的。为了有效地对TiO_2涂层表面进行紫外线照射，研制了轮式扩散洗涤器。轮式扩散洗涤器由36块涂有TiO_2的板组成，这些板以10个间隔围绕一个作为紫外线源的黑光灯激进地设置。通过在36块表面涂上TiO_2的耐热玻璃，轮式扩散洗涤器可以利用太阳光作为任何方向紫外线的来源。采用轮式扩散洗涤器进行了HCHO的现场去除实验。以50 m^3/h的速度向轮式扩散洗涤器中加入0.7 ppm的HCHO，可保持80%的高HCHO去除率。少

Recently, Volatile Organic Compounds (VOCs) emitted from building materials, adhesives, gasoline, automobile exhaust gas has become a serious problem as the air pollution and indoor air pollution.Removal and treatment equipment for VOCs (Volatile Organic Compounds) in the air was developed by diffusion scrubber method. The equipment consisted of parallel plate type of diffusion scrubber with ACF (Activated Carbon Fiber) sheet. It could remove VOCs by flowing in the polluted air into the narrow space between two parallel ACF sheets. "Diffusion scrubber method" which flows the polluted air the narrow space between parallel plates has small aeration resistance, compared with the conventional air cleaning method used by "filtration". Therefore, diffusion scrubber method can treat a large volume of the polluted air due to its small aeration resistance. The removal equipment consists of a simple structure which has set the basic unit of the two ACF sheets to 410 layers. Between the two ACF s … More heets, in order to pass air, the spacer is inserted and the space between the two ACF sheets is 0.07mm.VOCs gases (Benzene, Toluene, Ethylbenzene, p-Xylene, Trichloroethylene, Tetrachloroethylene) of 400-500ppbv was introduced into the removal equipment at the air flow rate of 600m^3/h. As results of evaluation experiments, it was found that the removal equipment could remove VOCs at more than 90% of removal efficiency. At the air flow rate of 1200m^3/h, the high removal efficiency of 80% for VOCs were also acquired. And then, it was found that the removal efficiency the removal equipment was agreed with the theoretical value calculated from Gormley-Kennedy equation.In this study, the diffusion scrubber method was also combined with the photo catalyst action of titanium oxide (TiO_2), and the removal equipment for HCHO was developed to achieve high removal efficiency and small energy consumption. In order to irradiate efficiently ultraviolet rays to TiO_2 coated surface, the wheel type diffusion scrubber was developed. the wheel type diffusion scrubber consists of 36 boards coated with TiO_2 and they are set radically at 10 interval around a black light as a source of ultraviolet rays. By covering with the Pyrex glass outside 36 boards coated with TiO_2, the wheel type diffusion scrubber can use sunlight as a source of ultraviolet rays from any direction. The removal experiment of HCHO was carried out in the field by using the wheel type diffusion scrubber. 80% of high removal efficiency for HCHO was maintained to near the sunset by introducing 0.7 ppm of HCHO at 50 m^3/h to the wheel type diffusion scrubber. Less