Department of Building Science, Tsinghua University, Beijing, China.
Beijing Key Laboratory of Indoor Air Quality Evaluation and Control, Beijing, China.
Indoor Air. 2018 Mar;28(2):266-275. doi: 10.1111/ina.12441. Epub 2017 Dec 19.
Formaldehyde is a common indoor pollutant that is an irritant and has been classified as carcinogen to humans. Adsorption technology is safe and stable and removes formaldehyde efficiently, but its short life span and low adsorption capacity limit its indoor application. To overcome these limitations, we propose an in-situ thermally regenerated air purifier (TRAP) which self-regenerates as needed. This purifier has four working modes: cleaning mode, regeneration mode, exhaust mode, and outdoor air in-take mode, all of which are operated by valve switching. We developed a real-scale TRAP prototype with activated carbon as adsorbent. The experimental testing showed that the regeneration ratios for formaldehyde of TRAP were greater than 90% during 5 cycles of adsorption-regeneration and that through the 5 cycles, there was no damage to the adsorption material as confirmed by scanning electron microscope (SEM) and Brunauer-Emmett-Teller (BET) tests. The total energy consumption by the prototype for purifying 1000 m indoor air was 0.26 kWh. This in-situ thermal-regeneration method can recover the purifier's adsorption ability through at least five cycles.
甲醛是一种常见的室内污染物，具有刺激性，已被归类为人类致癌物。吸附技术安全稳定，能有效去除甲醛，但它的寿命短、吸附容量低限制了其在室内的应用。为了克服这些限制，我们提出了一种原位热再生空气净化器（TRAP），它可以根据需要自行再生。该净化器有四种工作模式：清洁模式、再生模式、排气模式和室外空气吸入模式，所有模式都通过阀门切换操作。我们开发了一个以活性炭为吸附剂的实际规模的 TRAP 原型。实验测试表明，在 5 次吸附-再生循环中，TRAP 对甲醛的再生率大于 90%，并且通过 5 次循环，扫描电子显微镜（SEM）和 Brunauer-Emmett-Teller（BET）测试证实吸附材料没有损坏。该原型净化 1000 立方米室内空气的总能耗为 0.26 kWh。这种原位热再生方法可以通过至少 5 个循环恢复净化器的吸附能力。
