• Title/Summary/Keyword: Acid gas removal

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Removal Characteristics of Gaseous Contaminants by a Wet Scrubber with Different Packing Materials (충진제의 종류에 따른 습식 스크러버의 가스상 물질 제거특성)

  • Han, Bang-Woo;Kim, Hak-Joon;Kim, Yong-Jin;Han, Kyeong-Soo
    • Journal of Korean Society for Atmospheric Environment
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    • v.23 no.6
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    • pp.744-751
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    • 2007
  • Wet scrubber is widely used to remove toxic gaseous contaminants in various industries such as semi-conductor industry, display manufacturing industry and so on. In this study, to optimize a packed bed scrubber as one of typical wet scrubber size while keeping its performance, four different packing materials were investigated at different air flow rates, liquid-gas ratios and pH values. Ammonia, hydrochloric acid and hydrofluoric acid were used as test gases to characterize the scrubber performance. Gas removal efficiency increased as the packing size decreased, which resulted in the increase of specific surface area. The increase of air flow rate led to the decrease of gas removal efficiency, while the increase of liquid-gas ratio led to the increase of gas removal efficiency. For the case of $NH_3$ gas, lower pH, and for the cases of HCl and HF, higher pH contributed to higher gas removal efficiency. Gas removal efficiency of a wet scrubber increased in the order of HCl < $NH_3$ < HF according to its water solubility.

Operation Characteristics of Pilot-scale Acid Gas Removal Process (Pilot 규모 산성가스 제거공정 운전 특성)

  • Lee, Seung-Jong;Yoo, Sang-Oh;Chung, Seok-Woo;Yun, Yong-Seung
    • 한국신재생에너지학회:학술대회논문집
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    • 2009.11a
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    • pp.533-536
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    • 2009
  • The gasification technology is a very flexible and versatile technology to produce a wide variety products such as electricity, steam, hydrogen, Fisher-Tropsch(FT) diesels, Dimethyl Ether(DME), methanol and SNG(Synthetic Natural Gas) with near-zero pollutant emissions. Gasification converts coal and other low-grade feedstocks such as biomass, wastes, residual oil, petroleum coke, etc. to a very clean and usable syngas. Syngas is produced from gasifier including CO, $H_2$, $CO_2$, $N_2$, particulates and smaller quantities of $CH_4$, $NH_3$, $H_2S$, COS and etc. After removing pollutants, syngas can be variously used in energy and environment fields. The pilot-scale coal gasification system has been operated since 1994 at Ajou University in Suwon, Korea. The pilot-scale gasification facility consists of the coal gasifier, the hot gas filtering system, and the acid gas removal (AGR) system. The acid gas such as $H_2S$ and COS is removed in the AGR system before generating electricity by gas engine and producing chemicals like Di-methyl Ether(DME) in the catalytic reactor. The designed operation temperature and pressure of the $H_2S$ removal system are below $50^{\circ}C$ and 8 kg/$cm^2$. The iron chelate solution is used as an absorbent. $H_2S$ is removed below 0.1 ppm in the H2S removal system.

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Preparation of Novel Sorbents for Gas-phase Mercury Removal

  • Lee, Si-Hyun;Rhim, Young-Jun;Park, Young-Ok
    • Carbon letters
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    • v.3 no.4
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    • pp.187-191
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    • 2002
  • In the present research, we prepared the activated carbon (AC) sorbents to remove gas-phase mercury. The mercury adsorption of virgin AC, chemically treated AC and fly ash was performed. Sulfur impregnated and sulfuric acid impregnated ACs were used as the chemically treated ACs. A simulated flue gas was made of SOx, NOx and mercury vapor in nitrogen balance. A reduced mercury adsorption capacity was obtained with the simulated gas as compared with that containing only mercury vapor in nitrogen. With the simulated gas, the sulfuric acid treated AC showed the highest performance, but it might have the problem of corrosion due to the emission of sulfuric acid. It was also found that the high sulfur impregnated AC also released a portion of sulfur at $140^{\circ}C$. Thus, it was concluded that the low sulfur impregnated AC was suitable for the treatment of flue gas in terms of stability and efficiency.

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Gas and particle removal characteristics of a novel electrostatic precipitation type air cleaner using an activated carbon filter as an electrode (활성탄 섬유 필터를 전극으로 활용한 정전 방식의 공기정화장치의 가스 및 입자 제거 특성 분석)

  • Lim, Gi-Taek;Kim, Yong-Jin;Han, Bangwoo;Woo, Chang Gyu;Shin, Weon Gyu;Kim, Hak-Joon
    • Particle and aerosol research
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    • v.14 no.1
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    • pp.9-16
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    • 2018
  • We have developed an electrostatic precipitation (ESP) type air cleaner for indoor air quality and investigated its performances regarding CADR (Clean air delivery rate), single-pass efficiency and gas removal efficiency. The ESP air cleaner used an ACF (Activated carbon fiber) filter for gas removal and the ACF as a high voltage electrode for particle removal. The ESP air cleaner was tested in a chamber with the volume of $1m^3$ regarding CADR and gas removal efficiency. The applied CADR area of the ESP was $1.8m^2$. Gas removal efficiency was tested with 3 gases (Acetaldehyde, Acetic acid, Ammonia). As the results of the gas removal efficiency, the ESP air cleaner shows the removal efficiencies of 90, 98 and 85% for acetaldehyde, acetic acid and ammonia, respectively.

Enhancement of HF Gas Removal Efficiency of a Scrubber in Semiconductor Manufacturing Process by using ANCOVA Technique (ANCOVA를 이용한 반도체공정 스크러버 HF 가스 제거 개선)

  • Kim, S.J.;Lee, M.;Xu, J.;Lim, S.;Lee, H.;Koo, J.
    • Journal of ILASS-Korea
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    • v.18 no.2
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    • pp.81-86
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    • 2013
  • To comply with the regulation of the reinforcing Clean Air Conservation Act, it is necessary for the semiconductor manufacturers to develop effective low-concentration acid gas abatement system to treat the flue gas. The low-concentration acid gas was found to be harder to deal with than the high-concentration one. In this study, the effect of various potential treatments such as air-assist nozzle spraying, magnetizing the scrubbing water, and adding surfactants to spraying and scrubbing water were investigate through the application of the statistical ANCOVA method, which was proved to be very useful tool when the inlet concentration of acid gas could not be controlled precisely and it affected the removal efficiency of the abatement system.

MOLECULAR SCALE MECHANISM ON EVAPORATION AND REMOVAL PROCESS OF ADHERENT MOLECULES ON SURFACE BY BURNT GAS

  • Yang, Y.J.;Lee, C.W.;Kadosaka, O.;Shibahara, M.;Katsuki, M.;Kim, S.P.
    • International Journal of Automotive Technology
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    • v.7 no.2
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    • pp.121-128
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    • 2006
  • The interaction between adherent molecules and gas molecules was modeled in the molecular scale and simulated by the molecular dynamics method in order to understand evaporation and removal processes of adherent molecules on metallic surface using high temperature gas flow. Methanol molecules were chosen as adherent molecules to investigate effects of adhesion quantity and gas molecular collisions because the industrial oil has too complex structures of fatty acid. Effects of adherent quantity, gas temperature, surface temperature and adhesion strength for the evaporation rate of adherent molecules and the molecular removal mechanism were investigated and discussed in the present study. Evaporation and removal rates of adherent molecules from metallic surface calculated by the molecular dynamics method showed the similar dependence on the surface temperature shown in the experimental results.

SO$_2$ and NOx Reaction Characteristics of Waste Clam Sorbent in Fixed Bed Reactor

  • Jung, Jong-Hyeon;Shon, Byung-Hyun;Yoo, Kyung-Sun;Kim, Hyun-Gyu;Lee, Gang-Woo;Kim, Young-Sik
    • Proceedings of the Korean Environmental Health Society Conference
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    • 2003.06a
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    • pp.152-156
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    • 2003
  • Air pollution problems due to the emission of pollutants from the various industrial facilities become serious issues and lots of air pollution control processes have been developed. To remove the SO$_2$ and NOx emitted from the solid waste incinerator and coal fired power plants, we studied the Ca-based sorbent which was prepared by waste clam and limestone. The objectives of this study were to develop a clam-based sorbent for removal of SO$_2$ and NOx, and to investigate the physicochemical properties of the waste clam sorbent. In order to determine acid gas removal capacity of sorbent, the batch study on SO$_2$ and NOx removal was performed with the Ca-based sorbent in the fixed bed reactor. Results of the research revealed that clam-based sorbent can be used as the iron-manufacturing industry and chemical adsorbents for the removal of acid gases because the lime content of the waste calm was more than 53.92%. From physicochemical analysis and gas reaction experiments, it could be concluded that clam is good sorbent for the removal of SO$_2$ and NOx in waste incinerator and flue gas desulfurization processes.

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Acid Gas Removal Characteristics for Syngas using Fe Oxidization Process (철 산화법을 이용한 합성가스내 산성가스 제거 특성)

  • Lee, Seung-Jong;Hwang, Sang-Yeon;Yoo, Young-Don;Yun, Yong-Seung
    • 한국신재생에너지학회:학술대회논문집
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    • 2007.06a
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    • pp.804-807
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    • 2007
  • The acid gas removal (AGR) system was designed and installed to remove $H_2S$ in coal syngas in the pilot-scale coal gasification system for producing chemicals like Dimethyl Ether(DME). The syngas from the coal gasification at the rate of $100{\sim120$ $Nm^3$/hr included pollutants such as fly ash. $H_2S$, COS, $NH_3$, etc. The designed temperature and pressure of the AGR system are below 50oC and 8 kg/$cm^2$. Fe-chelate was used as an absorbent. $H_2S$ was stably removed below 0.5 ppm in the AGR system when the concentration of $H_2S$ was $150{\sim}450$ ppm. The pH of Fe-chelate solution was also stably maintained between $8{\sim}9$. FeMgO absorbent was also tested to remove $H_2S$ in the lab-scale AGR system and $H_2S$ was also removed below 0.5 ppm in the initial operation.

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Molecular Dynamics Study for Improving the Adhesion of Paint (도료의 부착성 개선을 위한 분자동역학적 연구)

  • Yang, Young-Joon;Lee, Chi-Woo
    • Journal of Advanced Marine Engineering and Technology
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    • v.31 no.8
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    • pp.932-938
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    • 2007
  • The interaction between adherent molecules and gas molecules was modeled in molecular scale and simulated by the molecular dynamics method in order to understand the evaporation and removal processes of adherent molecules on metallic surface using high temperature gas flow. Methanol molecules were chosen as adherent molecules to investigate effects of adhesion quantify and gas molecular collisions because the industrial oil has too complex structures of fatty acid. The effects of adherent quantify, gas temperature and surface temperature for the evaporation rate of adherent molecules and the molecular removal mechanism were investigated and discussed in the present study. Evaporation and removal rates of adherent molecules from metallic surface calculated by the molecular dynamics method showed the similar dependence on surface temperature shown in the experimental results.

Removal Effect of Residue Pesticide of Organic Acid Salt in Alkali Aqueous Solution (알칼리 수용액상에서 유기산염의 잔류농약 제거효과)

  • Lee, Jae-duk;Lee, Man-Ho
    • Applied Chemistry for Engineering
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    • v.10 no.6
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    • pp.907-912
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    • 1999
  • In this study, removal effect of residue pesticides on vegetable and fruit using organic acid salt in alkali solution were investigated by gas chromatography and measurement of detergency. Generally, for the removal methods of residue pesticides and oily pollution were used chemical detergent or organic solvent. Specially, in our experiment, we only used material of food additives and trisodium citrate were superior to other organic acid salt. It was investigated that removal effect of pesticides was superior to chemical detergent.

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