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Micro Bench-flow Reactor를 이용한 LNT 촉매의 NO 흡장과 정화성능에 관한 연구
윤주웅(Joo Wung Yoon),황승권(Seung Kwon Hwang),황인구(In Goo Hwang),박심수(Simsoo Park),이진하(Jin Ha Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
본 연구에서는 디젤엔진에서 배출되는 질소산화물의 저감을 위한 후처리장치인 LNT(질소산화물 흡장 및 저감형 촉매)의 특성을 파악하기 위하여 희박한 배기가스상태에서의 질소산화물에 대한 촉매의 기본적인 흡장성능과 환원제를 분사하여 인위적으로 농후상태를 만든 후, 촉매 내에 이미 저장되어 있던 질소산화물의 환원반응에 의한 촉매후단부에서의 배출특성을 파악하기 위한 실험이 진행되었다. 실험을 위한 LNT 시편은 실제 촉매로부터 작은 사이즈로 가공된 후, Canned 처리하여 Micro bench-flow reactor에 장착하였으며 분사된 피드가스성분들은 실제 배기가스의 환경을 만들기 위해서 각각 3가지의 가열성분, 비 가열성분으로 나누어 분사되는 환경조건에서 다양한 반응온도와 공간속도를 반응변수로 하여 LNT 촉매의 흡장성능과 환원제에 따른 질소산화물의 배출특성을 파악하였다. In this study, experimental investigation had been undertaken to analyze the basic performance on NO(nitrogen oxide) storage in lean phase and NO reduction by spraying of reducing agents in rich phase of exhaust gas on LNT(Lean NOx Trap) as a kind of after-treatment system used to reduce NOx emission from a diesel engine. In case of the reduction of the stored NO, outlet concentration at LNT downstream was measured. Test LNT material for experiments is from commercial LNT. After being canned by stainless-steel, it was built in Micro bench-flow reactor. Compositions of feed gases, 3 heated and 3 no heated gases were sprayed in LNT upstream to analyze the characteristics of LNT and various temperature and space velocity as response variables for test were used. Under above-mentioned, experimental research had been conducted.
마이크로 벤치-플로우 리액터를 이용한 LNT 촉매의 NO 흡장과 정화성능에 관한 연구
윤주웅(Joo Wung Yoon),황승권(Seung Kwon Hwang),황인구(In Goo Hwang),박심수(Simsoo Park),이진하(Jin Ha Lee),여권구(Gwon Koo Yeo) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.8
본 연구에서는 디젤엔진에서 배출되는 질소산화물의 저감을 위한 후처리장치인 LNT(Lean NOx Trap, 흡장형 De-NOx 촉매)의 특성을 파악하였다. 먼저 희박한 배출가스 상태에서의 질소산화물 중 산화질소에 대한 촉매의 기본적인 흡장성능을 알아본 후, 다양한 환원제를 분사하여 인위적으로 배출가스를 농후한 상태를 만들었다. 농후한 상태에서는 희박한 상태에서 촉매 내에 흡장되어 있던 산화질소가 촉매의 환원반응에 의해서 질소로 전환된 후 촉 매후단부에서 산화질소 배출농도를 측정하였다. 본 연구에서 사용된 LNT(Lean NOx Trap)시편은 실제 디젤 차량에 서 사용되는 LNT 촉매로부터 Reactor에 장착될 수 있도록 작은 사이즈로 절단 및 가공된 후, SUS304의 stainless 재질로 재가공 처리한 후에 Micro bench-flow reactor에 장착하였다. 분사된 피드가스성분들은 실제 배출가스의 분위기를 만들기 위해서 각각 3가지의 가열성분, 비가열 성분으로 나누어 분사된다. 이러한 조건들에서 다양한 반응온도와 공간속도를 반응변수로 하여 LNT(Lean NOx Trap)의 흡장성능과 환원제종류에 따른 산화질소의 배출특성을 파악하였다. We carry out an experimental investigation to analyze the basic performance of NO(nitric oxide) storage in a lean phase and also analyze the NO reduction achieved by the spraying of reducing agents in the rich phase of the exhaust gas in an LNT(Lean NOx Trap). This is an after-treatment system used to reduce the NOx emissions from a diesel engine. If the stored NO is reduced, we measure the outlet concentration downstream of the LNT. The test LNT material used in the experiments is commercial LNT. After being canned into stainless-steel (SUS304), it was built in a micro bench-flow reactor. Compositions of feed gases, three heated and three no heated gases were sprayed upstream of the LNT to analyze the characteristics. We use various temperatures and space velocities as response variables.
LNT 촉매사이즈별 모사가스 특성에 따른 NO 흡장과 정화성능 대한 실험적 연구
황승권(Seung Kwon Hwang),윤주웅(Joo Wung Yoon),황인구(In Goo Hwang),이진하(Jin Ha Lee),박심수(Simsoo Park) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
LNT(Lean NOx Trap) catalysts are capable of reducing exhaust NOx emissions from Diesel engines. NOx is stored on the catalyst substrate during the lean exhaust condition and is reduced under rich exhaust condition during the regeneration event. In this study, It used test-rig that will be able to depict actual diesel vehicle, In order to examine NO Adsorption and Reduction on modal gas characteristic of the various LNT catalyst size. To compare NO adsorption efficiency, feed gas with lean condition had sprayed on the variable of temperature and space velocity, LNT catalyst size. Also, To compare NO reduction efficiency, feed gas with rich condition which includes reductant had sprayed on the same variable. The test LNT catalyst for experiments, from commercial LNT, had been canned by stainless-steel 304. The CLD400 fast NO analyzer was used as a NO measurement equipment.
LNT 촉매를 이용한 디젤엔진의 질소 산화물 저감방법에 관한 연구
유정빈(Jung Been You),윤주웅(Joo Wung Yoon),명차리(Cha-Lee Myung),박심수(Simsoo Park) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
This study is to identify the general characteristics of Lean NOx Trap Catalyst and validation of NOx emission control method in a light duty diesel engine. In the low-load condition, the experimental procedure was as follows: In the first step, nitrogen oxide was stored in LNT catalyst for a long period time. And then, the cylinder inside was controlled with temporarily rich air-fuel ratio by using post- injection. In this situation, the inner temperature of LNT located at engine downstream was rapidly increased till its activation temperature. According to this rising temperature, NOx was discharged as form of N2 through a chemical reaction. As a result, we found that the amount of NOx from the engine was largely reduced.
승용디젤엔진에서 운전조건 제어를 통한 LNT 촉매의 NOx 저감 특성에 관한 연구
황승권(Seung Kwon Hwang),고아현(Ahyun Ko),윤주웅(Joo Wung Yoon),명차리(Cha-Lee Myung),박심수(Simsoo Park),김은석(Simsoo Park) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Lean NOx Trap (LNT) catalysts are capable of reducing exhaust NOx emissions from diesel engines. LNT stores NOx in lean condition and exhausts N2 by reducing NOx in rich condition. To make exhaust gas rich condition, there are two ways to add a reductant into exhaust gas. One is external injection in exhaust system and the other is method of engine operation condition control. In this study, NOx reduction characteristic of LNT catalysts using engine control for light-duty diesel engine was investigated. If the concentration of reductant is exceeded, excessive amount of reductant will slip throughout LNT and cause another emission problem. Thus LNT regeneration with precise engine control parameters can make higher NOx conversion efficiency and prevent another emission problem.