真空紫外灯动态降解空气中低浓度甲醛的研究

以集中空调中处理室内可挥发性有机物(VOCs)为应用背景,搭建了试验台.实验研究了真空紫外灯(主波长254 nm,185 nm)降解甲醛的影响因素以及产生O3的情况.研究表明,在产生的O3浓度低于室内空气质量标准(0.16mg/m3)的情况下,真空紫外灯也能够高效地降解空气中低浓度甲醛(＜1 mg/m3);甲醛降解率与反应器空气流速及甲醛初始浓度成反比;降解速率与甲醛初始浓度成正比,与反应器空气的流速成反比;绝对湿度对真空紫外灯降解甲醛有一定的影响;反应器空间大小对甲醛降解影响比较显著.应用于集中空调系统净化室内空气中VOCs,取得了很好的效果.

Research on VUV lamp dynamic degradation of trace formaldehyde in air

On the background of degradating VOCs in indoor air that is used in central air-conditioning,an experimental platform was set up.Vacuum ultraviolet lamp(245 nm,185 nm) that can produce some ozone was studied to degradate formaldehyde.Experimental research shows that VUV lamp has high degradation ratio on trace formaldehyde(less than 1 mg/m~3) when the ozone is less than the ozone value of the national indoor air quality standard(0.16 mg/m~3).Degradation ratio of formaldehyde is in inverse proportion to air velocity and inlet formaldehyde concentration.The degradation rate of formaldehyde is in direct proportion to inlet concentration of formaldehyde,but in inverse proportion to air velocity.Absolute humidity has some influence on degradation ratio of formaldehyde;size of the reactor has a remarkable influence on the purifying effect.A good indoor air quality has been achieved after VUV being used in a central air-conditioning system.