• 제목/요약/키워드: NOx removal

검색결과 242건 처리시간 0.041초

Radical을 이용한 디젤 엔진의 NOx 제거 특성 (NOx Removal Characteristics Using Radical In A Diesel Engine)

  • 전제형;최승환;전충환;장영준;이광학
    • 대한기계학회:학술대회논문집
    • /
    • 대한기계학회 2000년도 추계학술대회논문집B
    • /
    • pp.715-719
    • /
    • 2000
  • It is reported that we are facing the serious environment pollution difficulties such as acid rain, green house effects, etc. The gaseous matter CO, NOx, SOx, VOCs which are regarded as main factors for these current pollutions are mainly emitted from power plants and vehicles. Therefore several leading countries are regulating the related laws strictly, especially exhaust emissions from a Diesel engine without an after treatment device. The Objective of this study is to find out NOx removal characteristics focused on emissions of a Diesel engine using radical at each engine speed and load. It is generated from outer air and put into a mixing chamber in the end of exhaust line. In addition, the optimum temperature condition to activate reaction by radical is experimentally carried out. Concentration of exhaust emissions is analyzed from the gas anlayzer(KaneMay) and FTIR to estimate by-products.

  • PDF

선대 평판형 플라즈마 반응기에서 NOx 제거에 미치는 자계의 영향 (Effect of Magnetic Field on NOx Removal for Wire-Plate Plasma Reactor)

  • 박재윤;손성도;한상보;이동훈;김종달;문영훈
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 1999년도 하계학술대회 논문집 E
    • /
    • pp.2251-2252
    • /
    • 1999
  • In this paper, the effect of magnetic field was measured on NOx removal characteristics for wire-plate plasma reactor with magnetic field applied to electric field vertically. NOx from simulated diesel engine flue gas are decomposed by the corona discharge of DC, AC and Pulsed voltages in wire-plate reactor. Consumption power increased with increasing discharge voltage. When magnetic field was applied to electric field vertically, consumption power decreased. NOx removal rate and arc transition voltage of plasma reactor with magnetic field were higher than those of plasma reactor without magnetic field.

  • PDF

NOx 제거용 고체흡수제 개발 (Development of solid absorbents for the removal of NOx)

  • 손종락
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 1997년도 추계학술대회 논문집 학회본부
    • /
    • pp.709-712
    • /
    • 1997
  • Selective removal of NOx by binary oxide systems of Ba-Cu and Mn-Zr was investigated. These mixed oxides were effective in removing NOx at $400^{\circ}C$ by absorption in or on the solid as nitrate. The reaction was investigated by oxidation of NO which was promoted in the presence of $O_2$ on Mn or Cu sites. Then, the oxidized species were stored in the solid as nitrate ions on Ba or Zr sites.

  • PDF

촉매 코팅방법에 따른 기능성여과포의 NO 제거 반응 특성 (Effects of Catalyst Coating Methods on NO Removal Characteristics of Functional Fabric Filters)

  • 강민필;송윤섭;이효송;김상도;박영옥;황택성;이영우
    • Korean Chemical Engineering Research
    • /
    • 제40권6호
    • /
    • pp.725-728
    • /
    • 2002
  • NOx와 먼지 동시 제거용 기능성 여과포 개발의 일환으로 $V_2O_5/TiO_2$ 계열의 상용촉매를 사용하여 P-84, Nomex, PTFE 여과포에 코팅하였다. 사용된 코팅 방법은 Sol-gel법, Spray 법 그리고 Dip 코팅 방법이었으며 코팅방법이 여과포의 NOx 제거 반응에 미치는 영향을 조사하였다. NOx 제거반응실험은 여과포의 작동온도에 맞는 $100-250^{\circ}C$의 반응온도범위에서, 공간속도 $5,000hr^{-1}$, 산소농도 6%, $NH_3/NO$ 몰비는 1.0의 조건하에서 수행되었다. 본 연구에서 시도된 세 가지 코팅 방법 중 촉매량의 조절 및 균일한 코팅이 용이한 Sol-gel법에 의해 제조된 기능성여과포가 가장 좋은 NOx 전환율을 나타냈다.

무성방전 플라즈마 전극구조에 대한 질소산화물 제거효율 연구 (A Study on NOx Removal Efficiency Depending on Electrode Configurations of Silent Discharges)

  • Hyung-Taek Kim;Young-Sik Chung;Myung-Whan Whang;Elena. A. Filimonova
    • 한국안전학회지
    • /
    • 제17권3호
    • /
    • pp.112-117
    • /
    • 2002
  • 무성 (유전체 장벽)방전기구의 질소산화물(NOx)제거효율에 대한 화학 반응역학의 전산모사 및 실험적 특성이 비교 조사되었다. 방전 전극구조에 따른 여러 종류의 유전체 장벽 방전기구가 구현되었으며 응용 방전환경 별 질소산화물(NOx)제거특성이 이론적, 실험적으로 고찰되었다. 전산모사 모델링은 유해 배가스에 대한 플라즈마 응용기구의 수학적 근접모델을 기초로 하였고 각 방전광(스트리머) 채널의 주 활성입자 생성에 의한 화학반응 종들의 비균일, 비평형 분포특성을 고려하였다. 모델링 전산모사로 얻어진 질소산화물(NOx) 제거효율은 관찰 실험특성과 오차 허용범위 내의 일치성을 나타내었다.

코로나 방전에 의한 NOx, $So_2$동시제거에서 첨가제의 영향 (Effect of an Additives on Simultaneous Removal of NOx, $So_2$by Corona Discharge)

  • 박재윤;고용술;이재동;손성도;박상현
    • 한국전기전자재료학회논문지
    • /
    • 제13권5호
    • /
    • pp.451-457
    • /
    • 2000
  • Experimental investigations on the effect of two kinds of additives ; aqueous NaOH solution and ammonia(NH$_3$) for removal of NOx and SO$_2$ simultaneously by corona discharge were carried out. The simulated combustion flue gas was[NO(0.02[%])-SO$_2$(0.08[%])-$CO_2$-Air-$N_2$] Volume percentage of aqueous NaOH solution used was 20[%] and $N_2$flow rate was 2.5[$\ell$/min] for bubbling aqueous NaOH solution Ammonia gas(14.81[%]) balanced by argon was diluted by air. NH$_3$ molecular ratios(MR) based on [NH$_3$] and [NO+SO$_2$] were 1, 1.5 and 2.5 The vapour of aqueous NaOH solution and NH$_3$was introduced to the main simulated combustion flue gas duct through injection systems which were located at downstream of corona discharge reactor. NOx(NO+NO$_2$) removal rate by injecting the vapour of aqueous NaOH solution was much better than that by injecting NH$_3$however SO$_2$removal rate by injecting NH$_3$was much better than that by injecting the vapour of aqueous NaOH SO$_2$removal rate slightly increased with increasing applied voltage. When the vapour of aqueous NaOH solution and NH$_3$were simultaneously injection NOx and SO$_2$ removal rate were significantly increased.

  • PDF

CuO/γ-Al2O3 흡수제/촉매를 이용한 SOx/NOx 제거 반응특성 (Reaction Characteristics of SOx/NOx Removal Using CuO/γ-Al2O3 Sorbent/Catalyst)

  • 유경선;김상돈
    • 대한환경공학회지
    • /
    • 제22권4호
    • /
    • pp.671-678
    • /
    • 2000
  • 열중량분석기와 관형 고정층 반응기에서 $CuO/{\gamma}-Al_2O_3$ 흡수제/촉매의 SOx와 NOx 동시제거 반응특성에 대하여 고찰하였다. $CuO/{\gamma}-Al_2O_3$ 흡수제/촉매의 아황산가스 제거능은 반응온도 $450^{\circ}C$와 담지량 6wt% 이상에서 담체인 알루미나의 반응참여에 의하여 급격히 증가하였다. $CuO/{\gamma}-Al_2O_3$ 흡수제/촉매의 탈질 효율은 반응온도, $370^{\circ}C$에서 최대값을 보였으며 그 이상의 온도에서는 $NH_3$가스의 산화반응에 의하여 반응온도가 증가할수록 제거효율은 감소하였다. 흡수제/촉매 표면에 sulfate가 존재하는 경우 최대 탈질 효율을 보이는 반응온도는 증가하였다. SOx와 NOx 동시 제거반응에서 $CuO/{\gamma}-Al_2O_3$ 흡수제/촉매의 NO제거 활성은 $NH_4HSO_4$와 같은 암모늄염의 생성으로 인하여 크게 감소하였다. SOx와 NOx 동시제거 반응에 있어서 최대의 탈질 효율을 보이는 반응온도는 $SO_2$ 가스의 존재로 인하여 $400^{\circ}C$로 증가하였다.

  • PDF

체가름-진동 및 페인팅에 의해 이산화티탄이 고정된 UHPC의 NO제거량 평가 (Evaluation of NOx Removal Amount of UHPC with Titania fixed by Sieving-Vibration & Painting Methods)

  • 김병일;오상근;김수연
    • 한국건축시공학회:학술대회논문집
    • /
    • 한국건축시공학회 2021년도 봄 학술논문 발표대회
    • /
    • pp.193-194
    • /
    • 2021
  • Ti-salt agglomerated titanium dioxide photocatalyst from sludge, which has various and excellent functions such as nitrogen oxide removal performance, antifouling performance, and bacteria removal performance, is intended to be applied to UHPC. The UHPC used in this study is supposed to have a high compressive strength of 100~200MPa and a high flowability of 600mm or more with a slump flow. Titanium dioxide is fixed to the UHPC surface by sieving through a test sieve and compaction and painting using a vibration compactor, and this is tested according to ISO 22197-1. The NO removal amount is evaluated by classification the result range.

  • PDF

연소가스관로와 방전영역 분리형 플라즈마 반응기에서 Nox, SOx 제거특성 (The removal characteristics of No, SOx for plasma reactor separated flue gas duct from discharge domain)

  • 박재윤;고용술;이재동;송원섭;박상현;이덕출
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 1999년도 하계학술대회 논문집 E
    • /
    • pp.2007-2009
    • /
    • 1999
  • In this paper, discharge domain of wire-cylindrical plasma reactor was separated from a gas flow duct to avoid unstable discharge by aerosol particle deposited on discharge electrode and grounded electrode. The NOx, SOx removal was experimentally investigated by a reaction induced to ammonium nitrate, ammonium sulfate using a low price of aqueous NaOH solution and a small quantity of ammonia. Volume percentage of aqueous NaOH solution used was 20% and $N_2$ flow rate was 2.5[$\ell$/min] for bubbling aqueous NaOH solution. Ammonia gas(14.82%) balanced by argon was diluted by air and was introduced to a main simulated flue gas duct through $NH_3$ injection system which was in downstream of reactor. The $NH_3$ molecular ratio[MR] was determined based on $NH_3$ to [NO+$SO_2$]. MR is 1.5. The NOx removal rates increased in the order of DC, AC and pulse, but SOx removal rates was not significantly effected by source of electricity. The NOx removal rate slightly decreased with increasing initial concentration but SOx removal rate was not significantly effect by initial concentration, and NOx, SOx removal rates decreased with increasing gas flow rate.

  • PDF

저온 H2-SCR용 PtNi/W-TiO2 촉매에 조촉매 CeO2가 NOx 저감에 미치는 영향 (Effect of Co-catalyst CeO2 on NOx Reduction in PtNi/W-TiO2 Catalysts for Low-temperature H2-SCR)

  • 김정수;김영희
    • 청정기술
    • /
    • 제29권4호
    • /
    • pp.313-320
    • /
    • 2023
  • 대표적인 비암모니아성 선택적 촉매환원반응기인 H2-SCR의 활용성을 높이기 위하여 Ce를 조촉매로 활용한 PtNi/CeO2-W-TiO2의 촉매 분말을 합성하고 다공성 금속 구조(porous metal structure, PMS)에 코팅하여 선택적 촉매 환원에 의한 NOx 제거 특성을 평가하였다. CeO2를 조촉매로 사용한 H2-SCR은 CeO2를 사용하지 않은 경우에 비해 더 높은 NOx 제거 효율을 나타내었으며, CeO2 담지율 10 wt%에서는 반응온도 90℃에서 가장 높은 제거효율을 보였다. 한편, 촉매구조체인 PMS의 촉매 코팅량이 증가함에 따라 NOx 제거효율은 90℃ 이하에서는 향상되었으나, 120℃ 이상에서는 감소하는 경향을 보였고 공간속도를 4,000 h-1에서 20,000 h-1로 변경한 경우, 120℃이상의 온도에서 NOx 제거 효율이 향상되는 것을 확인할 수 있었다.