Original scientific paper

https://doi.org/10.31803/tg-20231212075502

Assessing Adsorption and Desorption Performance in the Recovery of Volatile Organic Compounds: A Carbon Fiber Filter Design Perspective

Dong-Hwan Jeon ; Institute for Advanced Engineering, 175-28 Goan-ro 51beon-gil, Cheoin-gu, Yongin-si, Gyeonggi-do, Korea
Hoon-Min Park ; EM SOLUTION Co. Ltd. Kyunggi-do, Suwon, Korea Graduate School of Mechanical Engineering, Kyunggi University
Hyun-Min Jung ; EM SOLUTION Co. Ltd. Kyunggi-do, Suwon, Korea Graduate School of Mechanical Engineering, Kyunggi University
Dal-Hwan Yoon ; Department of Electronic Engineering, Semyung University, 65 Semyung-ro, Jecheon-si, Chungcheongbuk-do, 27136, Korea *

* Corresponding author.

Abstract

In this study, the activated carbon fiber filter design and VOC adsorption and desorption performance were evaluated based on the development of a filter regeneration device to treat VOCs in high efficiency and low cost. Activated carbon fiber (ACF) has the advantage of fast adsorption speed and high adsorption capacity because micropores are formed on the surface and a large specific surface area. However, the specific gravity is about 25 times lower than that of activated carbon (AC), so the amount of adsorbent that can fill the same volume is small. In order to solve this problem, the regeneration device is implemented by repeating adsorption and regeneration for a short time, and a cylindrical adsorption filter made of activated carbon fiber is designed according to the operating conditions of the regeneration device. At this time, the pollutant gas and regenerated air are uniformly distributed over the entire adsorbent, and the flow characteristics according to the supply of the pollutant gas and the regeneration gas are analyzed. When the size of the lower part of the cylindrical adsorption filter is smaller than the size of the upper part under the condition that the pollutant gas flows downward, a uniform distribution of the pollutant gas is possible. In addition, as the space velocity decreases, the adsorption capacity decreases, and the differential pressure increases rapidly. Through the regeneration experiment, it was confirmed that the desorption concentration of MEK was higher and the desorption concentration was higher. In addition, the regenerated air is uniformly dispersed throughout the adsorption filter, toluene, o-xylene, and methyl ethyl ketone, which are representative substances of volatile organic compounds (VOCs), are injected with 400 ppm, and then regenerated air is supplied at 150 °C to analyze adsorption characteristics and regeneration concentrations. As a result of the experiment, the adsorption capacity ratio to 1 g of regeneration air according to the type of VOCs was 0.48, 0.36, and 0.25 g in the order of o-xylene, toluene, and methyl ethyl ketone. In addition, as the space velocity decreases, the adsorption capacity decreases, and the differential pressure increases rapidly. Through the regeneration experiment, it was confirmed that the desorption concentration of MEK was higher and the desorption concentration of o-xylene was discharged at a relatively low concentration. Moreover, even if the adsorption concentration changes, there was no difference in the regeneration concentration change. Therefore, the filter was designed based on the spatial speed of the regeneration device of 51,000 -h or less, and the adsorption capacity ratio to 1 g of the regeneration air amount was 0.1 g, thereby enhancing the filter's recycling performance and VOCs emission effect.

Keywords

activated carbon fiber; adsorption; flow analysis; regeneration system; volatile organic compounds

Hrčak ID:

321399

URI

https://hrcak.srce.hr/321399

Publication date:

5.12.2024.

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