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

近年来，随着大气污染和室内空气污染，建材、胶粘剂、汽油、汽车尾气排放的挥发性有机化合物(VOCs)问题日益严重，采用扩散洗涤法开发了空气中VOCs的去除和处理装置。该装置由平行板式扩散洗涤器和ACF(活性碳纤维)板组成。它可以通过将污染的空气流入两个平行的ACF薄片之间的狭窄空间来去除VOCs。“扩散洗涤法”使污染空气在平行板之间狭窄的空间流动，与传统的“过滤”空气净化方法相比，具有较小的曝气阻力。因此，扩散洗涤法由于曝气阻力小，可以处理大量的污染空气。去除设备由简单的结构组成，其将两个ACF片材的基本单元设置为410层。在两人之间的ACF S…在空气流量为600m~3/h的条件下，将400~500ppbv的VOCs气体(苯、甲苯、乙苯、乙苯、对二甲苯、三氯乙烯、四氯乙烯)引入脱除装置，通过评价实验发现，脱除装置对VOCs的脱除效率可达90%以上。当空气流量为1200m~3/h时，对VOCs的去除效率也达到80%以上。将扩散洗涤法与二氧化钛的光催化作用相结合，研制出高效、低能耗的甲醛脱除装置。为了有效地将紫外光照射到二氧化钛涂层表面，研制了轮式扩散洗涤器。轮式扩散洗涤器由36块涂有二氧化钛的板组成，它们基本上每隔10个间隔设置在黑光周围作为紫外线源。轮式扩散洗涤器通过在36块涂有二氧化钛的板外覆盖一层聚四氟乙烯玻璃，可以从任何方向利用阳光作为紫外线的来源。采用轮式扩散洗涤器进行了现场甲醛去除试验。在轮式扩散洗涤器中以50m~3/h的速度投加0.7ppm的甲醛，可使甲醛的高去除效率保持在接近日落时的80%。较少

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