• Title, Summary, Keyword: SCR(Selective Catalytic Reduction, 촉매환원법)

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Reduction of Nitrogen Oxides with Diesel Oil In Pilot Scale SCR(Selective Catalytic Reduction) Process (파일럿규모의 선택적촉매환원장치에서 디젤유를 이용한 질소산화물 제거)

  • Lee, In-Young;Yoo, Kyong-Ok
    • Journal of Korean Society of Environmental Engineers
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    • v.22 no.11
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    • pp.1977-1983
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    • 2000
  • SCR(selective catalytic reduction) pilot plant for reduction of the nitrogen oxides using diesel oil as a reductant was installed at the NG(natural gas) fired combined cycle and the activity of Pt(0.3%)/Zeolite catalyst was studied in real flue gas condition according to the amount of reductant. reaction temperature and space velocity. NOx conversion gradually increased with increasing the diesel oil concentration up to C/N ratio 5.5(C/N ratio: the ratio of the number of carbon atom to the number of NOx molecules included in the flue gas). Increasing the reaction temperature. NOx conversion increased and reached a maximum conversion of 50% at $190^{\circ}C$. NOx conversion did not changed with increasing the space velocity up to 18,500/hr and then gradually decreased. These results reveal the potential for diesel oil as a reductant for de-NOx SCR process.

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Removal of NOx by Selective Catalytic Reduction Using Ceramic Foam Supports (SCR반응에서 세라믹 폼 지지제를 이용한 NOx 제거)

  • 한요섭;김현중;박재구
    • Proceedings of the Korea Air Pollution Research Association Conference
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    • pp.141-142
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    • 2003
  • 최근 자동차 수요증가 및 산업용 보일러 둥 급증하는 추세이며 이로 인한 대도시 대기오염 문제는 위험수위에 도달해 있다. 이러한 산업용 보일러, 화력발전소등 고정배출원과 자동차에서 발생하는 배기가스에는 인체에 유해한 일산화탄소(CO), 질소산화물(NOx), 황산화물(SOx)등이 다량 함유되어 있다. 유독성 가스중 질소산화물(NOx) 저감방법에는 특히 선택적 촉매환원법(Selective Catalytic Reduction, SCR)이 가장 널리 적용되고 있다. SCR법은 촉매하에서 NH$_3$, CO, 탄화수소(메탄, 에탄올, 프로판 등)의 환원제를 사용하여 NOx를 $N_2$로 전환하시키는 기술이다. (중략)

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Effect of Steam-Treated Zeolite BEA Catalyst in NH3-SCR Reaction (NH3-SCR 반응에서 스팀 처리된 zeolite BEA 촉매의 영향)

  • Park, Ji Hye;Cho, Gwang Hee;Hwang, Ra Hyun;Baek, Jeong Hun;Yi, Kwang Bok
    • Clean Technology
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    • v.26 no.2
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    • pp.145-150
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    • 2020
  • Nitrous oxide (N2O) is one of the six greenhouse gases, and it is essential to reduce N2O by showing a global warming potential (GWP) equivalent to 310 times that of carbon dioxide (CO2). Selective catalytic reduction (SCR) is a technology that converts ammonia into harmless N2 and H2O by using ammonia as a reducing agent to remove NOx, one of the air pollutants; the process also produces high denitrification efficiency. In this study, the Fe-BEA catalyst was steam-treated at 100 ℃ for 2 h before Fe ion exchange in the fixed bed reactor in order to investigate the effect of the steam-treated Fe-BEA catalyst on the NH3-SCR reaction. NH3-SCR reaction test of synthesized catalysts was performed at WHSV = 180 h-1, 370 to 400 ℃ in the fixed bed reactor. The Fe-BEA(100) catalyst steam-treated at 100 ℃ showed a somewhat higher activity than the Fe-BEA catalyst at 370 to 390 ℃. The catalysts were characterized by BET, ICP, NH3-TPD, H2-TPR, and 27Al MAS NMR in order to determine the cause affecting NH3-SCR activity. The H2-TPR result confirmed that the Fe-BEA(100) catalyst had a higher reduction of isolated Fe3+ than the Fe-BEA catalyst, and that the steam treatment increased the amount of isolated Fe3+ as an active species, thus increasing the activity.

Control of SCR System for NOx Reduction in a Refuse Incineration Plant Using Repetitive Control Method (반복제어법을 이용한 소각장 NOx 저감용 SCR 시스템의 제어)

  • 김인규;여태경;김환성;김상봉
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.24 no.11
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    • pp.2762-2770
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    • 2000
  • The refuse incineration plant has an important role in saving the combustion energy for local heating system. But harmful combustion gas(NOx etc.) leads to some serious environmental problem. To reduce the gas, a SCR(Selective Catalytic Reduction)system is installed and it is controlled by adjusting the flow of ammonia gas(NH3) . In this paper, we apply a repetitive control method to reduce NOx by adjusting the flow of ammonia gas for SCR system in a refuse incineration plant which is located in Haeundae, Pusan, Firstly, we analyze the inlet NOx period by FFt method, and verify its periodic variations. Secondly, we design a repetitive control system by using state space model method. Lastly, the effectiveness of repetitive control system is shown by comparing to a conventional PID control in simulation and experimental results.

Reduction of NO Emissions from Diesel Combustion using a Catalytic Filter Reactor (촉매 필터 반응기를 이용한 경유연소 배가스 내의 NO저감)

  • 김지용;이상권;한영욱
    • Proceedings of the Korea Air Pollution Research Association Conference
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    • pp.257-258
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    • 2000
  • 산업 발전에 따른 대기오염물질의 배출로 인한 대기오염은 날로 심각해지고 있다. 대기오염물질중 NO는 제어에 대한 관심이 높아지고 있는데 NOx의 배연 처리 기술중 가장 보편화되어 있는 기술은 선택적 촉매 환원법(selective catalytic reduction, SCR)이다. 그중 암모니아(NH$_3$)를 환원제로 사용한 SCR법이 가장 널리 사용되고 있는데 이러한 NH$_3$에 의한 탈질공정은 미반응 NH$_3$의 배출, 경제성 등의 문제점이 있어 다른 환원제 즉 urea나 hydrocarbon을 사용하는 탈질기술의 개발이 요구되고 있으며, 특히 hydrocarbon이나 alcohol 계열을 이용한 SCR법에 대한 연구가 활발하게 진행되고 있다. (중략)

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A development of diesel engine De-NOx system using the selective catalytic reduction method (선택적 촉매 환원법을 이용한 디젤엔진의 De-NOx 시스템 개발에 관한 연구)

  • 정경열;김재윤;오상훈;박정일;류길수
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • pp.187-191
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    • 2001
  • In the paper, an approach to the development of the selective catalytic reduction process of NOx is presented. The reduction process can be efficiently controlled using a conventional combination of feed-forward and feed-back control structures. The aim of this paper is to test and verify an approach to the SCR process which is based on an industrial pilot plant of combustion and nitric oxide formation. The systems are based on measurements of a NOx removal ratio and the fuel flow rate, and NH$_3$slip which are usually available as a part of de-NOx control system.

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A Study on the Deactivation of Commercial DeNOx Catalyst in Fired Power Plant (화력발전소 상용 탈질 촉매의 활성저하 원인에 관한 연구)

  • Park, Kwang Hee;Lee, Jun Yub;Hong, Sung Ho;Choi, Sang Hyun;Hong, Sung Chang
    • Applied Chemistry for Engineering
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    • v.19 no.4
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    • pp.376-381
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    • 2008
  • The deactivation of $V/TiO_2$ catalyst used in SCR (Selective Catalytic Reduction) using ammonia as a reductant to remove the nitrogen oxides (NOx) in the exhaust gas from fired power plant has been studied. The activity and surface area of the catalyst (Used-cat) which was exposed to the exhaust gas for long period have considerably decreased. The characterizations of these SCR catalysts were performed by XRD, FT-IR, FE-SEM, and IC/ICP. The crystal structure of $TiO_2$ both fresh and used catalyst has not been changed. However, $(NH_4)HSO_4$ deposited on the used catalyst surface verified from FT-IR, FE-SEM, and IC/ICP analysis. Moreover, the durability of $SO_2$ was increased by diminishing sulfate ($SO_4^{-2}$)f form.

A development of reactor design software for De-NOx system using the selective catalytic reduction method (선택적 촉매 환원법을 이용한 De-NOx 시스템의 반응로 설계 전산프로그램 개발)

  • 정경열;오상훈;동은석;이수태;류길수
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • pp.187-191
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    • 2002
  • The exhaust gas from electric power stations, incinerators and industrial boilers contains considerable amount of harmful nitric oxide which causes air pollution. Selective catalytic reduction system with ammonia as a reductant(NH$_{3}$ SCR) have been applied to remove NOx since 1970. it is widely accepted that the NH$_{3}$ SCR process is the best method for the removal of NOx. In this paper the design of SCR reactor based on the NOx displacement is considered and the design program of SCR reactor is developed. The newly developed design program for de-NOx system maybe used in practice.

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NOx Removal of NH3-SCR Catalysts with Operating Conditions (공정조건에 따른 NH3-SCR용 촉매의 질소산화물 제거특성)

  • Park, Kwang Hee;Cha, Wang Seog
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.11
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    • pp.5610-5614
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    • 2012
  • Performance of catalyst was studied with various operating conditions for selective catalytic reduction of $NO_x$ with $NH_3$. It is confirmed that catalysts containing Mn and Cu have a good efficiency in the usage of oxygen by the $H_2$-TPR analysis. In the case of catalyst #1, $NO_x$ conversion was decrease with the increase of reaction temperature. But in the case of catalyst #2, $NO_x$ conversion was increased and then remained constant with the increase of reaction temperature. This phenomenon is due to the difference of the $NH_3$ oxidation of both catalysts.

Optimization for Flow Uniformity on the Selective Catalytic Reduction (SCR) System of a Steam Supply Boiler (열병합 보일러 SCR 장치의 유동 균일화를 위한 최적화 연구)

  • Park, Young-Bin;Jang, Choon-Man
    • Proceedings of the SAREK Conference
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    • pp.415-420
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    • 2009
  • Selective Catalytic Reduction(SCR) has been used for the reduction of $NO_x$ in a steam supply boiler. Recently, the reduction of $NO_x$ becomes an important research field because of its negative effect on an environment. Shape optimization of circular poles installed in the chamber, which is located in upstream of a SCR, has been performed using response surface method and three-dimensional Navier-Stokes analysis to enhance gas flow uniformity. Three design parameters, diameter, arranging angle and stretching ratio of circular poles, are considered in the present study. Throughout the shape optimization of a circular pole, gas flow uniformity is successfully increased by decreasing local recirculation flow in a square duct chamber. Recirculation flow observed in the corner of the square duct can be reduced by proper installation of a guide vane or a blunt body. Detailed flow characteristics are also analyzed and discussed.

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