• Journal of Korean Society of Environmental Engineers
• /
• v.37 no.8
• /
• pp.492-497
• /
• 2015

VOCs (Volatile Organic Compounds) are generally generated in the painting process, or at the company and laundry where use organic solvents. The VOCs consist of various hydrocarbons and has low calorific value due to its dilution with atmospheric air. Therefore, the VOCs are difficult to burn by a conventional fuel combustor. In this study, a novel plasma dump combustor was proposed for the treatment of low calorific VOC gases. This combustor was designed a combination of the characteristics in a plasma burner, a dump combustor and a 3D matrix burner. The combustor has good structure for maintaining enough residence time and reaction temperature for stable flame formation and VOC destruction. For investigating the performance characteristics of the plasma dump combustor, an experiment was achieved for VOC feed rate, VOC injector position, etc. Toluene was used as a surrogate of VOC. The novel combustor gave better performance than a conventional combustor, showing that VOC destruction rate and energy efficiency were 89.64% and 12.27 kg/kWh respectively, at feeding rate of 450 L/min of VOC of 3,000 ppm of toluene concentration.

• Journal of environmental and Sanitary engineering
• /
• v.15 no.3
• /
• pp.88-93
• /
• 2000

The objective of this study was to depict the kinetic behavior of the platinum catalyst for the deep oxidation of VOCs and their mixture. The oxidation characteristics of VOCs, which were benzene, toluene, and styrene, was studies on a 0.5% $Pt/{\gamma}-Al_2O_3$ catalyst. The reactivity increases in order benzene>toluene>styrene. In mixtures, remarkable effects on reaction rate and selectivity have been evident ; the strongest inhibiting effect was shown by styrene and increases in a reverse order with respect to that of reactivity. The reaction model reveals that there is a competition between the two reactants for the oxidized catalyst. Thus, the nontoxic catalytic oxidation process was suggested as the new VOCs control technology.

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 1999.10a
• /
• pp.99-100
• /
• 1999

국내의 경우 VOC분석에 대한 필요성이 날로 커지고 있어 많은 실험실이 VOC분석에 필요한 실험장비를 갖추고 있다. 대개의 경우 외곽에서 수입한 고가의 장비를 사용하고 있어 많은 외화가 기기구입에 소요되고 있는 실정이다. VOC 분석에는 기존의 GC 또는 GC-MS에 농축장치가 필요한데 자동화된 농축장치의 경우 매우 고가이므로 이의 확보가 어려운 실험실은 이에 대한 실험을 시도하지 못하고 있는 경우가 많다.(중략)

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 1999.10a
• /
• pp.385-386
• /
• 1999

국내에서도 대기중 VOC 측정이 정부 차원에서 각 지역별로 이루어지도록 법적 시행이 2000년부터 이루질 예정이다. VOC 분석에서 가장 필요한 것은 VOC분석용 표준물질인데 이는 매우 고가로서 모두 수입에 의존하고 있다. 본 연구에서는 앞으로 시행된 대기중 VOC 측정 대상 화합물중 10개의 HAP(hazardous air pollutant) target화합물이 함유된 저농도 ppb level의 HAP CRM을 개발하였다.(중략)

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2002.04a
• /
• pp.93-94
• /
• 2002

식생은 자연 VOC의 배출원으로써 대부분을 차지한다. 미국의 경우 자연 VOC의 배출량이 인위적인 것의 약 1.5배에서 많게는 10배 정도에 이를 것으로 추정하고 있으며 국내에서는 지금까지 자연적 VOC에 대한 직접적 배출량 산정은 한번도 이루어진 적이 없다. 우리나라는 전국토의 약 65%가 산림으로 이루어져 있어 NVOC가 인위적인 VOC의 양을 훨씬 초과 할 것이라는 것을 예측할 수 있다. (중략)

• Proceedings of the Korean Society for Quality Management Conference
• /
• 2004.04a
• /
• pp.633-638
• /
• 2004

Main purpose of existing VOC (the voice of customer) analysis is suppressing the VOC occurrence. But, in real situation, it is impossible to reduce the VOC occurrence to the zero level. Company's strategy to decrease specific customer complaints may cause another customer's complaints increase. Especially, in a financial industry, customer complaints are directly connected with company's profit. That is, the VOC from their profitable customer, product and channel is major concern of companies. In this paper, 1 reveal the relationship between CRM (customer relationship management) activity and VOC analysis and various analysis methods.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2016.10a
• /
• pp.861-863
• /
• 2016

대부분의 기업은 경영전략을 결정하는데 고객의 소리(VOC:Voice of Customer)를 매우 중요한 정보로 사용하고 있기 때문에 기업들은 다양한 방법으로 고객과의 관계증진을 위해 VOC 데이터를 이용하고 있다. 그러나 수집된 내부VOC 데이터에서 많은 정성적인 데이터를 포함하고 있으므로 분석하는 데는 한계가 있다. 본 논문에서는 최근 소셜 빅 데이터를 분석하는데 사용하고 있는 시스템을 이용하여 다른 업종에 비해 고객이 다양하고 서비스가 매우 중요한 여행사 내부 VOC를 분석한다. 적용 사례로서 국내 대표적인 여행사에 직접 적용하여 분석한 결과를 제시한다. 본 연구 결과 빅 데이터 분석 도구를 다른 서비스업종의 내부 VOC의 정성적인 데이터를 분석하는데 활용할 수 있는 가능성을 보여주었다고 사료된다.

• Journal of the Korea Organic Resources Recycling Association
• /
• v.14 no.1
• /
• pp.169-177
• /
• 2006

In this study, it was studied that the removal rate of VOC by the catalytic combustion. The combustion temperature was changed by the contact type of VOC(space velocity and catalyst depth) and the space velocity(SV) was defined by the rate of gas volume flow rate(Q, $m^3/hr$) over volume(V, $m^3$) of catalyst (SV=Q/V). The space velocity of catalytic combustor is maintained $10,000{\sim}50,000hr^{-1}$. it was studied that the conversion rate of VOC by the catalytic combustion. The combustion temperature was changed by the contact type of VOC and catalyst and the space velocity was defined by the rate of gas volume flow rate over volume of catalyst. The VOC which pass thru the heat exchanger was measured by the hydro ionic detector and measured the VOC removal rate by the activated catalyst in the reaction temperature range of 373K-423K. The removal rate was measured over 100 times. In the automobile painting booth The VOC concentration was 63.37ppm and the removal rate was 70 % at 373K and 78.92% at 423K. The removal rate was increased as increased the temperature.

• Journal of Korean Society for Atmospheric Environment
• /
• v.15 no.5
• /
• pp.567-574
• /
• 1999

Volatile organic Compounds(VOC) were measured at an industrial site in Ulsan in 1997 and 1998. Twenty-four hour integrated ambient air samples were collected in 6 L SUMMA canisters during the periods of June 3 to 8, 1997 and June 12 to 17, 1998. The daily mean concentrations of the total $C_2-C_9$ VOC in 1998 were about one third of those in 1997. This decrease of VOC levels may be attributable to the measures to control the emissions of VOC and the decrease of the plant operation. The decrease in the concentrations of oxygenated hydrocarbons and alkenes, especially, contributed to the decrease of the total VOC concentrations in 1998. Lowever concentrations of alkenes compared to aromatics in 1998 were due to the decrease of ethylene and propylene. In the present study, methanol (12.0 ppb) was the most abundant species, followed by acetone (10.1 ppb), propane (6.0 ppb), and vinyl chloride (5.9 ppb). The total concentrations of hazardous air pollutants (HAPs) in 1998 were reduced compared to those in 1997. However, this decrease is due to the drastic decrease of the concentration of methanol. Except methanol, the concentrations of HAPs have not varied much. It is suspected that the VOC control strategy for the Ulsan industrial area has been successful for reducing the total VOC levels but might not be effective in reducing the concentrations of HAPs.

• Korean Chemical Engineering Research
• /
• v.53 no.6
• /
• pp.755-761
• /
• 2015

Photocatalytic VOCs removal test in gas phase is generally performed by placing the light source on the outside due to maintaining a constant temperature inside the test chamber. The distance between light source and photocatalysts is importantin the VOC degradation test since the intensity of light is rapidly decreased as the distance farther. Especially, for the choice of light source as UVLED, this issue is more critical because UVLED light source emits lots of heat and it is hard to measure the exact concentration of VOCs due to changed temperature in the test chamber. In this study, we modified VOC removal test chamber base on the protocol of air cleaner test and evaluated the efficiency of photocatalystunder UVLED irradiation. Photocatalystsof two different samples (commercial $TiO_2$ and the synthesized vanadium doped $TiO_2$) weretested for the p-xylene degradation in the closed chamber system and compared with each other in order to exclude any experimental uncertainties. During the VOC removal test, VOC concentrations were monitored and corrected at regular time intervals because the temperature in the chamber increases ${\sim}20^{\circ}C$ due tothe heat of UVLED. The results showed that theconversion ratio of p-xylene has 40~43% difference before and after the temperature correction. Based on those results, we conclude that the VOC concentration correction must be required for the VOC removal test in a closed chamber system under UVLED light source and obtained the corrected efficiencies of various photocatlysts.