scholarly journals A Uniform Heating Technique for Cavity in Volatile Organic Compound (VOC) Removal System Using Slotted Waveguide Array

2021 ◽  
Vol 21 (2) ◽  
pp. 126-133
Author(s):  
Taewoo Yu ◽  
Hyunwook Lee ◽  
Sang-Jun Park ◽  
Sangwook Nam
Keyword(s):  
Organic Compound ◽  
The Other ◽  
Waveguide Array ◽  
Voc Removal ◽  
Impedance Data ◽  
Volatile Organic ◽  
Feeding Structure ◽  
Heating Uniformity ◽  
Slotted Waveguide ◽  
Removal System

In this study, two types of slotted waveguide are designed in the frequency of 2.45 GHz to improve the microwave heating uniformity of a quadrangular prism-shaped cavity in a volatile organic compound (VOC) removal system. Both types adopt the equivalent circuit approach used for a waveguide slot array antenna. The difference between the two types is the slot impedance extraction method of the waveguide slot array: one calculates the impedance taking the cavity structure into account and the other finds it in free space. Both methods show that the heating uniformity is improved by 52% compared with that of the conventional horn-type feeding structure system according to the simulation results. Even though there is no difference in the heating uniformity between the two models, it is confirmed that the slotted waveguide array feeding model designed by using the impedance data of the slot incorporating the cavity (SAWFM<sub>cavity</sub>) has about 6.35 dB better impedance matching characteristics than the other model designed by extracting the impedance data of the slot in free space (SAWFM<sub>free</sub>). Also, it is found that the SAWFM<sub>cavity</sub> shows more stable impedance characteristics with respect to the loading condition than the SAWFM<sub>free</sub>. Therefore, it is concluded that the impedance of the slot should be extracted taking the cavity into account for the design of the slotted waveguide feeding structure since it improves the reflection characteristic as well as the heating uniformity compared with the horn-type feeding structure.

Biochar for volatile organic compound (VOC) removal: Sorption performance and governing mechanisms

2017 ◽  
Vol 245 ◽  
pp. 606-614 ◽  
Author(s):  
Xueyang Zhang ◽  
Bin Gao ◽  
Yulin Zheng ◽  
Xin Hu ◽  
Anne Elise Creamer ◽  
...  
Keyword(s):  
Organic Compound ◽  
Volatile Organic Compound ◽  
Voc Removal ◽  
Volatile Organic

scholarly journals Volatile Organic Compound Emissions From Heated Synthetic Hair: A Pilot Study

2020 ◽  
Vol 14 ◽  
pp. 117863021989087
Author(s):  
Donna Auguste ◽  
Shelly L Miller
Keyword(s):  
African American ◽  
Pilot Study ◽  
Organic Compound ◽  
Flame Retardant ◽  
Volatile Organic Compound ◽  
The Other ◽  
Volatile Organic ◽  
Volatile Organic Compound Emissions ◽  
Research Questions ◽  
Measured Mass

Volatile organic compounds (VOCs) are emitted from a variety of household and personal care products. Many VOCs are known to be potentially toxic or carcinogenic. Synthetic hair is used in hair-styling practices, including practices in African American communities that involve singeing or heating the synthetic hair. The research questions that we sought to answer were as follows: Are VOCs emitted from singed or heated synthetic hair? If so, what are the VOC species and relative masses identified in singed or heated synthetic hair? We tested samples from 2 sources of singed and heated synthetic hair in a microchamber; one source was flame-retardant synthetic hair and the other source was non-flame-retardant synthetic hair. Our findings confirmed that VOCs are emitted from singed or heated synthetic hair for both types of sources. For flame-retardant synthetic hair, we identified and measured mass for species that included acetone, acetonitrile, 2-butanone, benzene, chloromethane, chloroethane, and 1,2-dichloroethane. For non-flame-retardant synthetic hair, we identified and measured mass for species that included acetone, acetonitrile, chloromethane, trichlorofluoromethane, and 2-propanol.

scholarly journals Gas Classification Using Combined Features Based on a Discriminant Analysis for an Electronic Nose

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Sang-Il Choi ◽  
Taekyu Eom ◽  
Gu-Min Jeong
Keyword(s):  
Discriminant Analysis ◽  
Organic Compound ◽  
Electronic Nose ◽  
Classification Performance ◽  
The Other ◽  
Global Feature ◽  
Noisy Environment ◽  
Volatile Organic ◽  
Combined Features ◽  
The Individual

This paper proposes a gas classification method for an electronic nose (e-nose) system, for which combined features that have been configured through discriminant analysis are used. First, each global feature is extracted from the entire measurement section of the data samples, while the same process is applied to the local features of the section that corresponds to the stabilization, exposure, and purge stages. The discriminative information amounts in the individual features are then measured based on the discriminant analysis, and the combined features are subsequently composed by selecting the features that have a large amount of discriminative information. Regarding a variety of volatile organic compound data, the results of the experiment show that, in a noisy environment, the proposed method exhibits classification performance that is relatively excellent compared to the other feature types.

Synthesis of hollow organosiliceous spheres for volatile organic compound removal

2014 ◽  
Vol 2 (45) ◽  
pp. 19298-19307 ◽  
Author(s):  
Hongning Wang ◽  
Mei Tang ◽  
Lu Han ◽  
Jianyu Cao ◽  
Zhihui Zhang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Water Vapor ◽  
Organic Compound ◽  
Adsorption Capacity ◽  
Silica Gel ◽  
Volatile Organic Compound ◽  
Water Vapor Adsorption ◽  
Voc Removal ◽  
Removal Capacity ◽  
Volatile Organic

Synthesized mesoporous hollow organosiliceous spheres exhibit the smallest water vapor adsorption capacity, the largest VOC removal capacity and the highest recyclability as compared to commercial silica gel and activated carbon.

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