• Title/Summary/Keyword: Water- Scrubber

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An Experiment on Particle Collection Characteristics of a Duct-type Wet Scrubber (덕트형 세정집진기의 입자포집 특성실험)

  • Yoo, Kyung-Hoon;Yeo, Kuk-Hyun;Son, Seung-Woo;Hwang, Kwang-Ho;Jung, Jin-Won;Kim, Yoon-Shin
    • Proceedings of the KSME Conference
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    • 2004.04a
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    • pp.1795-1800
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    • 2004
  • DOS and NaCl aerosol particles with geometric mean diameter of $0.1{\sim}3.0{\mu}m$ geometric standard deviation of $1.1{\sim}1.8$ and total number concentration of $450{\sim}400$ $particles/cm^3$ were used to determine collection efficiencies of a duct-type wet scrubber with respect to particle size. The tested operating variables included air velocity and water injection rate. It was shown from the experimental results that the collection efficiencies increased with increasing water injection rate and decreasing air velocity. It was also seen that the collection efficiency of the Duct-type wet scrubber is mainly governed by the mechanism of inertial impaction.

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Development of a Scrubber Wastewater Cleaning System to Improve Odor Removal Efficiency (악취저감 향상을 위한 스크러버 세정수 처리 시스템 개발연구)

  • Chung, Gu-Hoi;Im, Moon-Soon;Kim, Youn-Soo;Kim, Duk-Hyun
    • Clean Technology
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    • v.23 no.1
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    • pp.34-41
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    • 2017
  • The scrubber wastewater should be replaced frequently to maintain efficiency. Most chemical companies consign scrubber wastewater, because there are no wastewater treatment facilities. So scrubber wastewater is not frequently replaced because of high treatment cost. For this reason, the most scrubber exhaust gas exceeds the odor emission limit or has a phenomenon that the odor intensity of exhaust gas becomes higher. Therefore we have developed a scrubber wastewater cleaning system consisting of filtration and adsorption processes. The scrubber wastewater cleaning system was applied two chemical companies. We evaluated the water quality and odor reduction effect before and after system application. As a result, scrubber wastewater quality improved by 50% or more, odor reduction efficiency of scrubber exhaust gas improved by 20% or more. And the total operating costs of the scrubber could be reduced by 40% or more.

Effect of Recirculated Exhaust Gas Temperature on Performance and Exhaust Emissions in Diesel Engines with Scrubber EGR System (스크러버형 EGR시스템 디젤기관의 성능 및 배기 배출물에 미치는 재순환 배기온도의 영향)

  • 배명환;하태용;류창성;하정호;박재윤
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2002.05a
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    • pp.75-82
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    • 2002
  • The effects of intake mixture temperature on performance and exhaust emissions under four kinds of engine loads were experimentally investigated by using a four-cycle four-cylinder, swirl chamber type, water-cooled diesel engine with scrubber EGR system operating at three kinds of engine speeds. The purpose of this study is to develop the scrubber exhaust gas recirculation(EGR) control system for reducing $NO_x$ and soot emissions simultaneously in diesel engines. The EGR system is used to reduce NOx emissions. And a novel diesel soot-removal device with a cylinder-type scrubber which has five water injection nozzles is specially designed and manufactured to reduce soot contents in the recirculated exhaust gas to the intake system of the engine. The influences of cooled EGR and water injection, however, would be included within those of scrubber EGR system. In order to study the effect of intake mixture temperature, a intake mixture heating device which has five heating coils is made of a steel drum. It is found that the specific fuel consumption rate is considerably elevated by the increase of intake mixture temperature, and that NOx emissions are markedly decreased as EGR rates are increased and intake mixture temperature is dropped, while soot emissions are increased with increasing EGR rates and intake mixture temperature.

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A Study on Effect of Intake Mixture Temperature upon Fuel Economy and Exhaust Emissions in Diesel Engines with a Scrubber EGR System

  • Bae, Myung--Whan;Ryu, Chang-Seong;Yoshihiro Mochimaru;Jeon, Hyo-Joong
    • Journal of Advanced Marine Engineering and Technology
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    • v.28 no.2
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    • pp.315-331
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    • 2004
  • The effects of intake mixture temperature on performance and exhaust emissions under four kinds of engine loads were experimentally investigated by using a four-cycle. four-cylinder. swirl chamber type. water-cooled diesel engine with scrubber EGR system operating at three kinds of engine speeds. The purpose of this study is to develop the scrubber exhaust gas Recirculation (EGR) control system for reducing $\textrm{NO}_{x}$ and soot emissions simultaneously in diesel engines. The EGR system is used to reduce $\textrm{NO}_{x}$ emissions. And a novel diesel soot-removal device of cylinder-type scrubber with five water injection nozzles is specially designed and manufactured to reduce soot contents in the recirculated exhaust gas to the intake system of the engine. The influences of cooled EGR and water injection. however. would be included within those of scrubber EGR system. In order to survey the effects of cooled EGR and moisture on $\textrm{NO}_{x}$ and soot emissions. the intake mixtures of fresh air and recirculated exhaust gas are heated up using a heater with five heating coils equipped in a steel drum. It is found that intake and exhaust oxygen concentrations are decreased, especially at higher loads. as EGR rate and intake mixture temperature are increased at the same conditions of engine speed and load. and that $\textrm{NO}_{x}$ emissions are decreased. while soot emissions are increased owing to the decrease in intake and exhaust oxygen concentrations and the increase in equivalence ratio. Thus ond can conclude that $\textrm{NO}_{x}$ and soot emissions are considerably influenced by the cooled EGR.

A Study on Effect of Environmental Characteristics by Intake Mixture Temperature in Scrubber EGR System Diesel Engines

  • Bae, Myung-Whan;Ryu, Chang-Sung
    • Proceedings of the Korean Society Of Semiconductor Equipment Technology
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    • 2002.11a
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    • pp.100-111
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    • 2002
  • The effects of intake mixture temperature on performance and exhaust emissions under four kinds of engine loads were experimentally investigated by using a four-cycle, four-cylinder, swirl chamber type, water-cooled diesel engine with scrubber EGR system operating at three kinds of engine speeds. The purpose of this study is to develop the scrubber exhaust gas recirculation(EGR) control system for reducing $NO_x$ and soot emissions simultaneously in diesel engines. The EGR system is used to reduce $NO_x$ emissions. And a novel diesel soot-removal device of cylinder-type scrubber with five water injection nozzles is specially designed and manufactured to reduce soot contents in the recirculated exhaust gas to the intake system of the engine. The influences of cooled EGR and water injection, however, would be included within those of scrubber EGR system. In order to survey the effect of intake mixture temperature on performance and exhaust emissions, the intake mixtures of fresh air and recirculated exhaust gas are heated by a heating device with five heating coils made of a steel drum. It is found that the specific fuel consumption rate is considerably elevated by the increase of intake mixture temperature, and that $NO_x$ emissions are markedly decreased as EGR rates are increased and intake mixture temperature is dropped, while soot emissions are increased with increasing EGR rates and intake mixture temperature. Thus one can conclude that the performance and exhaust emissions are considerably influenced by the cooled EGR.

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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.

Study of spray characteristics according to the variation of swirl vane geometry for Fuel oil scrubber nozzles (연료유 스크러버 노즐의 스월베인 구조변화에 따른 분무특성의 수치해석적 연구)

  • Kim, In-Cheol;Lee, Kyung-Woo;Lee, Young-Ho
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2012.06a
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    • pp.203-203
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    • 2012
  • The Recovery facility, the scrubber is a collection device that injects liquid into the gas with the suspended particles using a spray nozzle. The liquid used is generally water. For the development of the design technology of a high efficiency scrubber, the spray characteristics according to the variation of the scrubber nozzle swirl vane was studied.

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Investigation of decontamination characteristics of a serial multiple pool scrubber system for consequence mitigation of severe accidents

  • Hyeon Ho Byun;Man-Sung Yim
    • Nuclear Engineering and Technology
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    • v.54 no.12
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    • pp.4585-4600
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    • 2022
  • A pool scrubber is often used as a wet-type design to mitigate the consequence of a severe nuclear accident. While studies indicated higher decontamination performance of a deeper pool, utilizing a very tall pool can be problematic due to potential structural stability and water backflow issues. This study proposes, as an alternative to a single pool system, a pool scrubber system composed of serially connected multiple pools with lower heights. Since large fraction of aerosol removal takes place in the injection region, serially connected pool scrubber system is expected to enhance the overall decontamination capability of a pool scrubber system. To support the analysis of the proposed system's decontamination capability, a new computer model was developed in the study to describe the bubble size dependent effect on aerosol removal including the effect of pool residence time. The accuracy of the new model was examined against experimental data for its validation. The proposed scrubber system composed of serially connected multiple shorter pools is found to have much improved decontamination performance over the current single pool system design.

NUMERICAL STUDY ON THE OPTIMAL DESIGN OF SPRAY SYSTEM IN PACKED BED SCRUBBER (충진층식 스크러버의 스프레이 시스템 최적 설계에 대한 수치해석적 연구)

  • Ko, S.W.;Ro, K.C.;Ryou, H.S.
    • Journal of computational fluids engineering
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    • v.12 no.1
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    • pp.28-34
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    • 2007
  • This study evaluates the performance of the packed bed scrubber and proposes the optimization of spray system for improvements of collection efficiency. The packed bed scrubber is used primarily in the semiconductor manufacturing process. The mean diameter of entering solid particles in scrubber is the submicron. The impaction between water droplets and solid particles is an important factor in removing the solid particles. Thus, the coverage area of spray system influences on the collection efficiency. The collection efficiency of a single droplet is calculated through the mathematical model and numerical calculations are performed for coverage area for each nozzle type (Droplet diameters: 500, 319.5, $289.5{\mu}m$) and injected directions (0, 15, $30^{\circ}$). In case of nozzle type 3, the collection efficiency of a single droplet is highest but the collection efficiency of spray system has lowest value because the ratio of flow rate between the gas and water is below 0.1. The results show the coverage area ratio is about 85% in the case of nozzle type 3 and downward sirection $15^{\circ}$. It was shown that a coverage area increase by two times than an existing spray system. In simulation of demister, collection efficiency by demister is predicted about 80% and the pressure drop in demister is below 3.5 Pa.

IMO 규정 대응 선박 배기가스 DePM, DeSOx 순환처리장치 (Recycle system) 개발

  • Ha, Sin-Yeong;Kim, In-Su
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2015.10a
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    • pp.64-65
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    • 2015
  • 본 연구는 PM과 SOx를 효과적으로 저감 시킬 수 있는 Water- Scrubber와 오염물과 세정수의 분리가 가능한 Purifier를 이용한 새로운 순환식 배기가스 세정시스템의 개발하여 PM, PAH 제거효율을 산정한 결과, PM과 PAH모두 유입 수 대비 99%이상 처리되는 것을 확인하였으며, 수질인자도 재사용이 가능한 유입수의 수준으로 분석되었다.

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