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선박용 디젤엔진의 Urea-SCR 이유체 노즐 설계기술
박형선 ( Hyung Sun Park ),이상지 ( Sang Ji Lee ),남동현 ( Dong Hyun Nam ),이문희 ( Mun Hee Lee ),홍정구 ( Jung Goo Hong ) 한국액체미립화학회 2016 한국액체미립화학회 학술강연회 논문집 Vol.2016 No.-
Worldwide environmental problem is a serious situation. The proportion of various marine vessels in the port to discharge nitrous oxide (NOx) is about 32%. IMO (International Maritime Organization) has decided to reduce emissions of NOx 80% from Tier1 proposed in 2000 to Tier3 started from 2016. If they can`t satisfy this condition, they can`t anchorage or navigate in ECA (Emission Control Area). In order to reduce the NOx, SCR technology is most suitable. In this study, we focused on studying the injector part of SCR technology. When stoichiometric 1 mole of urea is injected, 2 moles of NH3 are created. NH3 causes a SCR reaction by reacting with NOx. However, urea is decomposed by the side reaction of coming out HNCO, deposit formation is formed. In this study, it was to design a nozzle that can spray the optimal spray flow rate. Nozzle used in the experiment is efferverscent type. The result of the experiment, liquid flow rate was confirmed to be that they are dominated by the exit orifice diameter. In addition, it was also confirmed that there is no change of the liquid flow rate and air flow rate to change the aerorator at the same exit orifice. Further, there is little change in the SMD that air flow rate increases in 2 or more ALR. Finally, SMD of efferverscent nozzle was confirmed that is dominated by aerorator
Urea-SCR에 적용되는 이유체 노즐의 분무특성에 관한 실험적 연구
박형선 ( Hyung Sun Park ),홍정구 ( Jung Goo Hong ) 한국액체미립화학회 2017 한국액체미립화학회지 Vol.22 No.2
In order to reduce the NOx, SCR technology is most suitable. In this study, we focused on studying the injector part of urea-SCR system. When stoichiometric 1 mole of urea is injected, 2 moles of NH<sub>3</sub> are created. NH<sub>3</sub> causes a SCR reaction by reacting with NOx. However, urea is decomposed by the side reaction of coming out HNCO, deposit formation is formed. In this study, it was to design a nozzle that can spray the optimal spray flow rate. Test nozzle used in this experiment is efferverscent type. The result of the experiment, liquid flow rate was confirmed to be that they are dominated by the exit orifice diameter. The area ratio is defined by ratio of the area of exit orifice hole and that of aerorator. The droplet size was measured by varying the area ratios. In addition, it was also confirmed that there is no change of the liquid flow rate and air flow rate to change the aerorator at the same exit orifice. Further, It was confirmed that the droplet size was relatively uniform even though the area ratio was different. Finally, there is little change in the SMD that air flow rate increases in 0.3 or more ALR.
원형 및 타원형 오리피스를 갖는 Effervescent Type 이유체노즐의 분무특성
이상지 ( Sang Ji Lee ),박형선 ( Hyung Sun Park ),남동현 ( Dong Hyun Nam ),이문희 ( Mun Hee Lee ),홍정구 ( Jung Goo Hong ) 한국액체미립화학회 2016 한국액체미립화학회 학술강연회 논문집 Vol.2016 No.-
Experimental research was carried out to investigate the characteristics of the effervescent type twin-fluid spray nozzle with circular and elliptical exit orifice. After fixing the liquid flow rate, while controlling the air flow rate was observed such as flow rate and pressure inside nozzle, spray image. Also, discharge coefficient of the pressure-type equation and Jedelsky`s equation are calculated and compared these values and found to be greater about 3-4 times the Jedelsky`s equation. Nozzle pressure was proved according to the ALR, E2 is higher than E1 and E2 SMD was also observed smaller than E1 SMD. It is expected that the differences caused by the discharge coefficient value.
비원형 Effervescent Type 이유체노즐의 Discharge Coefficient에 관한 실험적 연구
이상지(Sang Ji Lee),박형선(Hyung Sun Park),홍정구(Jung Goo Hong) 한국추진공학회 2017 한국추진공학회 학술대회논문집 Vol.2017 No.5
본 연구는 비원형 Effervescent Type 이유체 노즐의 분사 특성을 조사하기 위한 실험적 연구를 수행하였다. 이를 위해 거의 동일한 노즐 출구 면적으로 가공한 2종류의 비원형 노즐 (E1, E2)과 1종류의 원형 노즐 (C)을 대상으로 비교 실험을 진행하였다. 이때 노즐에 장착된 Aerorator는 노즐 출구 면적과의 Aspect Ratio를 맞추기 위해 지름이 다른 3종류를 사용하였다. 따라서 각 노즐마다 3가지의 Aspect Ratio에 따라 3번의 실험을 진행하였으며, 전체 총 9종의 실험이 진행되었다. 실험은 Liquid의 유량을 고정시킨 후, 유입되는 Air의 양을 제어하며 진행하였으며, 노즐 내부 압력과 액적의 크기(SMD)를 측정하고 노즐에서 분사 이미지를 촬영하였다. 이를 통해 3종의 노즐의 유량 계수를 압력 분무 방정식과 Jedelsky 방정식을 비교 계산하였고, Jedelsky 방정식이 약 4배 정도 더 큰 값을 갖는 것을 확인하였다. 노즐에서 분사되는 SMD는 원형보다 비원형에서 더 작은 값을 갖는 것으로 나타났으며, 이는 유량 계수 값의 차이 의해 야기된 것으로 예상된다. An experimental study was carried out to investigate the injection characteristics of non-circular effervescent type twin-fluid nozzles. For this purpose, two types of non-circular nozzles (E1, E2) and one kind of circular nozzle (C) were used. At this time, the Aerorator mounted on the nozzle used three different diameters to match the aspect ratio with the nozzle exit area. Therefore, experiments were performed according to three aspect ratios for each nozzle, and a total experiments were conducted. Experiments were carried out by controlling the amount of air flowing after fixing the flow rate of the liquid, and the nozzle internal pressure and SMD were measured, and the jet image was taken from the nozzle. The discharge coefficients of the three kinds of nozzles were compared with the conventional equation and the Jedelsky’s equation, and the Jedelsky’s equation was found to be about 4 times larger. The droplet size (SMD) injected from the nozzle was found to be smaller in the non-circular shape than in the circular shape, which is expected to be caused by the difference of the discharge coefficient values.
중성염의 종류 및 농도가 sodium caseinate 의 거품성에 미치는 영향
양승택(Seung Taek Yang),박형선(Hyung Sun Park) 한국응용생명화학회 1993 Applied Biological Chemistry (Appl Biol Chem) Vol.36 No.6
To investigate the effects of neutral salts on the foaming properties of sodium caseinate, turbidity, surface tension, absolute viscosity, foaming ability and foam stability of the caseinate solutions(5%, w/v) with added NaF, Na₂SO₄, NaCl, NaNO₃, and NaSCN at concentrations of 0.1, 0.5, 1.0, 1.5 and 2.0 M were examined. NaCl and NaNO₃, improved the foaming ability compared to sodium caseinate without salt, and also Na₂SO₄, and NaF did the foaming ability at the concentrations of 0.1M and 0.5M, while NaSCN did not improve the foaming ability. For foaming ability optimal concentrations of the salts were 0.5, 1.5, and 1.0 M in Na₂SO₄, NaCl, and NaSCN, respectively. Additions of Na₂SO₄, NaF and NaNO₃ at 0.5 M concentrations improved the foam stability of sodium caseinate by 825%, 615%, and 53% compared to control, while those of NaSCN reduced foam stability.