• 제목/요약/키워드: Ocean emission

검색결과 340건 처리시간 0.029초

국내 선박 엔진의 NOx 배출현황 및 저감기술 개발에 관한 고찰 (A Study on the NOx Emission Status and Reduction Technologies of Domestic Marine Engine)

  • 강국진;김상현;김은찬
    • 한국해양환경ㆍ에너지학회지
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    • 제7권2호
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    • pp.57-63
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    • 2004
  • 본 논문에서는 국내 선박 디젤엔진의 NOx 배출 현황과 그 저감기술에 대해서 살펴보고자 하였다. 우선, 국내 선박 디젤엔진의 생산현황에 대해서 살펴보고, 다음으로 NOx 배출현황에 대해서 조사를 하였다. 마지막으로 NOx 배출 저감기술의 현황을 조사해 보았다. 본 연구를 통하여 국내에서 생산되는 선박용 디젤엔진이 IMO의 현재 NOx 배출 규제안을 만족하고 있는 것으로 파악이 되었다. 그러나 향후 더욱 엄격해질 IMO의 NOx 배출 규제안에 대응하기 위해서는 보다 더 고도화된 NOx저감기술의 개발이 필요할 것으로 예상된다.

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ZnO 기판의 불순물 속박 엑시톤 발광을 이용한 물성 분석 (Investigation on the Excitonic Luminescence Properties of ZnO Bulk Crystal)

  • 최준석;고동완;정민지;이상태;장지호
    • 한국전기전자재료학회논문지
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    • 제32권3호
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    • pp.196-200
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    • 2019
  • In this study, photoluminescence (PL) analysis was performed to evaluate the optical properties of commercial ZnO substrates. Particular attention was paid to the bound exciton (BX) luminescence, which is usually the strongest emission intensity of commercial substrates. At 15 K, PL analysis revealed that the BX peak due to donor-type impurities (donor-bound-exciton; DX) dominated, while two-electron satellite (TES) emission, donor-accepter pair (DAP) emission, and LO-phonon replica emission were also observed. The impurity concentration of the ZnO substrate was determined to be $10^{15}$ to $10^{16}/cm^3$ by examination of the temperature variation of DAP, while the half width and intensity change of the luminescence revealed that the temperature change of BX can be interpreted almost the same as the analysis of free-exciton emission.

직접분사식 디이젤의$NO_x$에 관하여 (On the $NO_x$ in Direct Injection diesel engine)

  • 안수길
    • 수산해양기술연구
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    • 제12권1호
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    • pp.1-6
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    • 1976
  • To investigate the relation of $NO_x$ emission and consumption rate in a direct injection diesel engine with a multihole nozzle under same fuel consumption and rpm, a naphthyl ethylenediaming method on NO, emission and Tektronix oscilloscop on the indicator diagrams have been used. Comparisons of the $NO_x$ emission and fuel consumption rate made on various conditions have led to the fllowing results. 1. The higher the injection pressure in the later injection time the lower $NO_x$ emission and the fuel consumption rate have been attained. 2. By the change of nozzle hole diameter under the same injection pressure, the $NO_x$ emission was much more lowered in the small diameter than large one, but fuel consumption rate was in inverse proption to the $NO_x$ emission. 3. The effect of injection spray angle, $\frac{1_n}{d_n}$ on $NO_x$ emission, fuel consumption rate under same injection time and injection pressure was neglectable.

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기후변화가 대형선망 고등어 어업의 최적탄소배출량에 미치는 영향분석 (A Study on the Optimal Emission of CO2 due to Climate Change : An Application for Large Purse Seine)

  • 최종두
    • Ocean and Polar Research
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    • 제39권3호
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    • pp.195-203
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    • 2017
  • The purpose of this paper is to estimate the optimal $CO_2$ emission in the maximum economic yield (MEY), maximum sustainable yield (MSY), and open access (OA) using a bioeconomic model. The results are as follows; in the case of $E_{MEY}$, $E_{MSY}$, and $E_{OA}$ levels, $CO_2$ emissions are estimated at $150,704,746CO_2/kg$, $352,211,193CO_2/kg$, and $301,409,492CO_2/kg$ respectively. We show that the $E_{MEY}$ is more efficient than the other levels. That is, the level of $E_{MEY}$ signifies the optimal economic fishing usage as the most economically efficient usage for large purse seine fishery catching mackerel species. The emission of $CO_2$ in $E_{MEY}$ is the lowest level. Also, the impacts of climate changes such as ocean temperature increase, ocean acidification, and the combined impact thereof show that the biomass of mackerel decreases.

선박에서 배출되는 NOx의 배출량 규제에 대한 대응 방안 고찰 (A review on the Plan for the Further Reinforcement of the NOx Emission Limit for Marine Diesel Engine)

  • 장미숙;김상현;강국진
    • 한국해양환경ㆍ에너지학회지
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    • 제7권4호
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    • pp.174-179
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    • 2004
  • 현재 국내 엔진 제작사에서 주로 이용하는 NOx 저감 기술은 low NOx fuel nozzle과 연료분사시기 조정과 같든 엔진 개량방법이지만, 향후 NOx에 대한 규제가 강화될 것을 대비하여 고효율의 NOx 제거기술(EGR, Dn, SCR 등) 도입과 정책적 지원이 요구된다. 또한, THC, PM, CO 등에 대한 추가 규제가 예상되므로 기타 대기오염물질을 제거할 수 있는 DPF/CDPF DOC, HCC 등의 기술을 선박에 도입하기 위한 연구가 이루어져야 한다. 선박에서 발생하는 대기오염물질을 규제하기 위한 법률의 제ㆍ개정시에는 내륙에서 운항되는 유람선 등에 대한 규제가 동시에 이루어져야 할 것이다.

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Greenhouse Gas Emission Analysis by LNG Fuel Tank Size through Life Cycle

  • Park, Eunyoung;Choi, Jungho
    • 한국해양공학회지
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    • 제35권6호
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    • pp.393-402
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    • 2021
  • As greenhouse gas emissions from maritime transport are increasing, the International Maritime Organization is continuously working to strengthen emission regulations. Liquefied natural gas (LNG) fuel is less advantageous as a point of CO2 reduction due to the methane leakage that occurs during the bunkering and operation of marine engines. In this study, greenhouse gas emissions from an LNG-fueled ship were analyzed from the perspective of the life cycle. The amount ofmethane emission during the bunkering and operation procedures with various boil-off gas (BOG) treatment methods and gas engine specifications was analyzed by dynamic simulation. The results were also compared with those of other liquid fuel engines. As a result, small LNG-fueled ships without a BOG treatment facility emitted 32% more greenhouse gas than ships utilizing marine gas oil or heavy fuel oil. To achieve a greenhouse gas reduction via a BOG treatment method, a gas combustion unit or re-liquefaction system must be mounted, which results in a greenhouse gas reduction effect of about 25% and 30%. As a result of comparing the amount of greenhouse gas generated according to the BOG treatment method used with each tank size from the perspective of the operating cycle with the amounts from using existing marine fuels, the BOG treatment method showed superior effects of greenhouse gas reduction.

Global Carbon Budget and Ocean Buffering against Rising Atmospheric CO2 Concentration

  • Kwon, O-Yul
    • 한국환경과학회지
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    • 제11권8호
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    • pp.773-781
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    • 2002
  • The natural carbon cycle has been perturbed since the mid-19th century by anthropogenic CO$_2$emissions from fossil fuel combustion and deforestation due to population growth and industrialization. The current study simulated the global carbon cycle for the past 42 years using an eight-box carbon cycle model. The results showed that since the terrestrial biospheric carbon sink was roughly offset by the deforestation source, the fossil fuel emission source was partitioned between the atmospheric and oceanic sinks. However, the partitioning ratio between the atmosphere and the ocean exhibited a change, that is, the carbon accumulation rate was faster in the atmosphere than in the ocean, due to a decrease in the so-called ocean buffering capacity. It was found that the ocean buffering capacity to take up excess CO$_2$decreased by 50% in terms of the buffer factor over the past 42 years. Accordingly, these results indicate that if the current CO$_2$emission trend continues, the future rate of increase in the atmospheric CO$_2$concentration will accelerate.

모형 가스터빈 연소기의 2차공기 주입에 따른 연소배출특성 (Combustion Emission Characteristics on the Effect of Secondary Air Injection in Model Gas Turbine Combustor)

  • 김규성;임경달;이도형
    • 한국해양공학회지
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    • 제14권3호
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    • pp.84-89
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    • 2000
  • The purpose of this study is to investigate the combustion emission characteristics by the effect of secondary air injection and variation of the excess air ratio in combustion field of model gas turbine combustor. For this purpose, mean temperature, CO, $CO_2$, $O_2$ and HC concentrations were measured by changing excess air ratio and secondary air injection. As a result of this study, mean temperature was decreased and CO, HC emission increased by increasing the excess air ratio of secondary air. Therefore, this results showed the secondary air injection effected strongly on the flame structure and combustion emission characteristics.

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모형 가스터빈 연소기에서 2차공기 주입이 연소장에 미치는 영향 (Effects of Secondary Air Injection in Combustion Field of Model Gas Turbine Combustor)

  • 김규성;임경달;이동형
    • 한국해양공학회:학술대회논문집
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    • 한국해양공학회 2000년도 춘계학술대회 논문집
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    • pp.171-176
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    • 2000
  • This purpose of this study is to investigate the combustion emission characteristics on the effect of secondary air injection in combustion field of model gas turbine combustor changing excess air ratio. For this purpose, meantemperature, CO, CO2, O2 and HC concentration were measured by changing excess air ratio and secondary air injection. As a result of this study, meantemperature, CO2 emission was decreased and CO emission increased by increasing the excess air ratio of secondary air. therefore, This paper showed the effect of Secondary air injection on flame structure, combustion emission characteristics.

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