【摘要】 设计了一种应用于供热、通风及空调(HVAC)系统,能降解室内挥发性有机物(VOCs)的新型管状泡沫镍光催化空气净化器.该净化器能够灵活改变迎风面积来适应不同流速的HVAC系统,具有阻力低等优点.通过室内浓度的甲醛污染物的降解实验,考察了外部质量传递对该净化器性能的影响,并对其反应动力学和能量效率进行了分析.结果表明:甲醛的反应速率随着流速的增加先增加而后下降,在流速不小于0.66 m/s时光催化反应不受外部质量传递的影响;一级反应动力学模型能够很好地描述甲醛的光催化降解过程;与多玻璃管光催化空气净化器相比,所提出的管状泡沫镍光催化空气净化器的能量效率增加了138%.更多还原

【Abstract】 A novel tubular foam-nickel photocatalytic air purifier was presented for degrading indoor volatile organic compounds(VOCs),which is applicable to the heating,ventilating and air-conditioning(HVAC) system.The purifier is flexible enough to adapt different HVAC systems with different air velocities by changing the windward area.Moreover,the purifier had low pressure drop.The effect of external mass transfer on the photocatalytic performance of the purifier was investigated and the reaction kinetics and energy efficiency were analyzed by degrading gaseous formaldehyde at an indoor concentration level.The experimental results show that the reaction rate of formaldehyde increases firstly and then drops with the increase of air velocities.The reaction rate is free from the external mass transfer when the air velocity is no less than 0.66m/s.The degradation of formaldehyde can be described by a first-order kinetic model.The purifier shows a 138% increase in energy efficiency in comparison with a multiple glass-tube air purifier.更多还原