Characteristics of Double-Layer, Large-Flow Dielectric Barrier Discharge Plasma Source for Toluene Decomposition

Abstract

The direct decomposition of toluene-containing humidified air at large flow rates was studied in two types of reactors with dielectric barrier discharge (DBD) features in ambient conditions. A scalable large-flow DBD reactor (single-layer reactor) was designed to verify the feasibility of large-flow plasma generation and evaluate its decomposition characteristics with toluene-containing humidified air, which have not been investigated. In addition, another large-flow DBD reactor with a multilayer structure (two-layer reactor) was developed as an upscale version of the single-layer reactor, and the scalability and superiority of the features of the multilayer structure were validated by comparing the decomposition characteristics of the two reactors. Consequently, the large-flow DBD reactor showed similar decomposition characteristics to those of the small-flow DBD reactor regarding applied voltage, flow velocity, flow rate, and discharge length, thus justifying the feasibility of large-flow plasma generation. Additionally, the two-layer reactor is more effective than the single-layer reactor, suggesting multilayer configuration is a viable scheme for further upscaled DBD systems. A high decomposition rate of 59.5% was achieved at the considerably large flow rate of 110 L/min. The results provide fundamental data and present guidelines for the implementation of the DBD plasma-based system as a solution for volatile organic compound abatement.

Ammonia synthesis by nonthermal plasma catalysis: a review on recent research progress

“…It is worth noting that most current relevant developments in the field are at the laboratory scale. As shown in figure 8(b), for potential industrial adoption of NTP-catalytic ammonia synthesis, high throughput reactors need to be developed, which can be built on relevant developments such as the scalable large-flow DBD reactor designed for NTP-assisted toluene decomposition (with the flowrate up to 110 l min −1 ) [96].…”

Influence of humidity on the plasma‐assisted CO2 conversion

“…The total power consumed by plasma reactor and operation of a high-voltage supply was measured as 30 W using a Watt monitor (TAP-TST8N), manufactured by Sanwa Supply Inc. that was inserted between the commercial power supply and the high-voltage supply. [29,30] On the other hand, the discharge power was calculated using the discharge voltage and current measurements. A high-voltage probe (Tektronix, P6015a) and a current probe (MAGNELAB, Current transformer CT-C1.0) were connected to a digital oscilloscope (Tektronix, MDO34) for this purpose.…”

Design and Characterization of an Upscaled Dielectric Barrier Discharge-Based Ten-Layer Plasma Source for High-Flow-Rate Gas Treatment

“…However, a low processing capacity (less than a few L/min of gas flow at the lab scale) and lack of knowledge of various characteristics of the DBD plasma at high gas flow rates are the major drawbacks that hinder the practical application of DBD plasma to the abatement and control of indoor air pollutants [28][29][30][31]. Moreover, all the design methodologies and optimizations, such as the treatment of building ventilation air and industrial exhaust, are confined to the laboratory scale and are thus impractical for real-world applications.…”

“…In contrast, another idea that upscales the cylindrical DBD reactors is to use a catalytic monolith to support a large-volume discharge zone, while the overall system and discharge characteristics are confined by the geometric size of the monolith [35][36][37][38]. In this regard, as has been shown previously, two types of high-flow-rate DBD reactors, specifically single-and two-layer DBD reactors, have been developed [29]. These reactors can treat exhaust gases at flow rates that are two orders of magnitude greater (up to 110 L/min) compared to those of small-flow DBD reactors, which are typically limited to 1 L/min or lower.…”

“…To address this need, an upscaled, high-flow-rate, ten-layer DBD reactor with a processing capacity of up to 1000 L/min was designed and fabricated in this study, which serves as an upgraded version of the previously reported single-and two-layer DBD reactors [29]. Furthermore, its complete design techniques and fundamental characteristics were demonstrated.…”