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国外流行国内静默 静电集尘空净水土不服?

2017-08-23 09:13:23   中国经济网

臭氧不应成为“拦路虎”

国内比较了解空净产品的消费者对静电集尘式产品的第一反应往往是,它会产生臭氧,对人体有害。会有这样的反应并非没有原因。记者了解到,在过去六七年中,静电集尘式空气净化器多次曝出臭氧超标问题,被曝出的品牌就包括国内静电集尘空气净化器代表性企业远大。

因朵科技董事长贾春生告诉《中国电子报》记者,臭氧是在电离空气的过程中产生的,追根溯源在于净化器的供电电源。如果是选择质量过硬、可调节脉冲宽度、稳定输出电压的电源,那么产生的臭氧将在国际标准可控范围内;而如果选择不可调节脉冲频率的电源,那么输出的电压就很不稳定,极易产生超标臭氧。前者成本在五六百元,后者成本几十元。如果厂商不注重产品品质选择低价电源,就容易造成臭氧问题。

冉宏宇告诉记者,按照国际标准,臭氧浓度在50ppm以下的环境,对人体无害。大气中含臭氧量通常在15~25ppm之间,城市中臭氧含量在125ppm,这些都属正常范围。静电集尘式产品只要将臭氧释放量控制在50ppm以内,那么对人体就是无害的。据他介绍,现在的产品基本上都能做到这一点。

空气堡联合创始人、CTO魏巍告诉记者,静电集尘产品初始应用于电厂除尘,分为高压电离和集尘区两部分,完全不需要考虑臭氧等问题。后来延伸到了民用。民用市场一开始也不关心这个问题,直到美国对于臭氧问题的关注。静电集尘式产品后来衍生出很多技术流派,比如离子风、ESP多级、ifd等,主要目的都是为了有效保留单次净化效率,同时降低击穿空气电离的强度,减少臭氧产生。到现在,静电集尘式产品在臭氧控制和净化效率上都有比较好的效果。

冉宏宇还向记者透露,解决臭氧问题有两个技术点,一是优化电路设计,将臭氧释放量调低到微量水平,二是开发新的催化材料,将臭氧还原为氧气。

净化效率仍需加强

从目前的技术进展看,市面上的静电集尘产品基本上可以解决臭氧超标问题,在不久的将来,臭氧应不再是阻碍消费者选购静电集尘产品的因素。事实上,在专业人士看来,净化效率才是眼下静电集尘式产品亟待攻克的难题。

中国家电研究院技术检测所室内环境分析测试中心主任张晓向记者透露,相对HEPA过滤式产品,静电集尘式产品的净化效果相对差一点。在家用领域,受限于成本,其去除颗粒物的CADR值无法做到太大,比如滤网式净化器的CADR值能轻松做到500~1000,但是静电产品目前在家用领域最大也只有400左右。

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