活性炭纤维网吸附床电热行为的实验研究

电热再生是一种效率高、通用性强、能耗低的活性炭材料再生方式，备受挥发性有机化合物治理、室内空气净化及化学防护领域的关注。以活性炭纤维网装填吸附床为研究对象，系统研究了通电电压、吹扫气流比速以及床层吸水率对吸附床电热行为的影响。结果表明：以50 V电压为干燥床层输入1 W·h电能，床层温度可升至144.6℃,与20 V通电电压相比，温度提升了63.8℃;增大吹扫气流比速可降低床层电热过程结束时的温度，并延长通电加热的时间；吸水床层在电热期间出现升温平台，在通电电压为40 V、吹扫气流比速为0.08 L/(min·cm²)条件下，根据吸水率的不同，升温平台最长可持续30 min。此外，通电电压和吹扫气流均能影响升温平台对应的温度和持续时间。

EXPERIMENTAL STUDY ON ELECTROTHERMAL BEHAVIORS OF ACTIVATED CARBON FIBER MESH ADSORPTION BED

Electrothermal regeneration is a kind of activated carbon material regeneration method with a short treating time, strong versatility and low energy consumption, and it has attracted much attention in the field of volatile organic compounds treatment, indoor air purification and chemical protection. In this paper, we used activated carbon fiber mesh to fill the adsorption bed, and systematically studied the effects of energizing voltage, specific velocity of purge gas, and bed water adsorption on the electrothermal behavior of the adsorption bed. The results showed that:setting the energizing voltage to 50 V and inputting 1 W·h electrical energy for the drying bed, the bed could rise to 144.6℃, which was 63.8℃ higher than that at 20 V. Increasing the specific velocity of purge gas reduced the temperature at the end of the electrothermal process and prolong the heating time. There was a temperature rise platform in the water adsorption bed during electric heating. Under the conditions of a voltage of 40 V and a specific speed of purge gas flow of 0.08 L/(min·cm2), the heating platform could last up to 30 minutes according to different water adsorption rates. In addition, the energizing voltage and purge gas could affect the temperature and duration of the heating platform.