• Title/Summary/Keyword: 친환경 선박

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특집:녹색선박 SCR시스템 기술개발 현황 - 선박용 질소산화물 저감장치 개발의 필요성 및 규제현황

  • Jeong, Gyeong-Yeol;Park, Chang-Dae;Im, Byeong-Ju;Kim, Seong-Yun;Kim, Min
    • 기계와재료
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    • v.24 no.2
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    • pp.28-36
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    • 2012
  • IMO의 해양오명 방지협약(MARPOL 73/78)에 의하면 선박 배기가스에 포함된 질소산화물(NOx)과 황산화물(SOx)의 배출 제한을 강화한 IMO Tier III 기준이 2010년에 발효되어 2016년부터 신조선에 적용되며, NOx는 85% 이상 저감할 것을 요구하고 있다. 국제적으로 적용되는 선박배출가스 기준을 국내에 적용하고, 검증하기 위해서는 이를 시험할 수 있는 시험/검증 절차와 방법을 개발하는 것 또한 시급한 문제이다. 선진국들은 이미 오염물질 배출 저감 장비를 채택하고 대기 중 오염물질 측정 장치 도입을 추구하는 추세이며, 친환경 선박 기자재 개발로 차세대 녹색선박기술 선점을 주력하고 있다. 대한전기협회에서는 독일 VGB사의 "VGB-R 302 He 1998 $2^{nd}$ Revised edition" 2010년 판을 참고하여 발전소에 대한 SCR 시스템의 성능시험 및 진단 권장지침을 만들어 이용하고 있지만, 선박 SCR 시스템에 대한 내용은 정해진 바 없으며, 이를 개발하는 것 또한 중요하다.

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특집:녹색선박 SCR시스템 기술개발 현황 - 선박용 SCR 국내.외 현황 및 시장동향

  • Jeong, Gyeong-Yeol;Park, Chang-Dae;Im, Byeong-Ju;Bae, Jong-Uk
    • 기계와재료
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    • v.24 no.2
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    • pp.18-26
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    • 2012
  • 지구 환경오염문제가 대두되면서 세계 각국에서는 환경오염을 최소화하려는 움직임이 활발히 이루어지고 있다. 국제해사기구(IMO)에서는 해양 대기오염의 상당량이 선박에서 배출되는 배기가스에 의한 것으로 판단하고 있으며, 이에 따라 선진국을 중심으로 선박관련 환경규제 및 선박 배기가스 배출기준을 점차적으로 강화해 가고 있고, 친환경 선박 및 기자재 개발을 적극적으로 진행하고 있다. 현재 선박에 적용 가능한 NOx 제거장치로는 ECR(Exhaust Gas Recirculation), SCR(Selective, Catalytic Reduction), SAM(Scavenge Air Moistening) 등이 개발되었으며, 연소온도 조절 및 촉매 환원반응 등을 이용하여 NOx를 제거하고 있다. 현재 개발된 탈질설비 중 현실적으로 가장 적합한 것은 SCR시스템으로 인식되고 있으나, 연료효율 감소로 인하여 가스연료를 이용하거나 새로운 연료개발 등 사용연료에 변화를 주는 방법들이 미래의 대안으로 제시되고 있다.

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A Study on Establishing Green Port based on Eco-Ship Assessment Scheme (친환경 선박 평가 제도를 통한 그린포트 구축 연구)

  • Kim, Jin-Hyung;Chun, Kang-Woo;Lee, Jung-Yup;Lee, Hyun-Ju
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2014.06a
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    • pp.203-204
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    • 2014
  • As the marine environment is becoming more important with growing demand for the marine transport due to the globalization, some advanced ports have made efforts to establish Green Port to protect the marine environment. The Korean ports as the world's fifth ranked country have also made efforts to establish Green Port but most efforts are focused on hardware aspects such as renewable energy generation, installation of AMP and fuel conversion of port facilities. The purpose of this study is to develop Eco-Ship assessment scheme for Green Port in a software aspect and present measures to improve global green-competitiveness of Korean ports through diversification of their efforts for Green Port.

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Study on the Occupational Group and Essential Educational Elements of Future Seafarer Suitable for Industry 4.0 (4차 산업에 적합한 미래 해기사의 직업군과 필수 교육 요소에 관한 연구)

  • Kim, Sanghee;Park, Hankyu;Ha, Minjae
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.28 no.6
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    • pp.1013-1022
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    • 2022
  • Recently, with the worldwide development of the fourth industry, the development of technologies for smart and eco-friendly ships is accelerating. With the emergence of autonomous vessels with complete unmanned or minimum personnel on board and eco-friendly fuel (methane, ammonia, electricity, etc.), the role of existing seafarers on board is expected to change significantly. To improve the competitiveness of seafarers in the future, predicting future seafarer occupation groups, improving the educational curriculum, and creating an educational system are necessary. In this study, eight occupational groups that seafarers may have in the future were derived through a review of earlier studies and brainstorming of maritime university students, incumbent seafarers and expert groups. A survey was conducted on the eight occupational groups using the Likert scale, and based on the results, a leading occupational group related to future seafarer was derived. The most likely occupational groups with high scores were remote control centre operators and cargo remote manager. In addition, essential educational elements to be educated first for these occupational groups were derived and presented.

Evaluation of cavitation characteristics for anodized 5000 series Al alloy with various sealing treatment in sea water (양극산화 기술이 적용된 5000계열 알루미늄 합금의 다양한 실링처리에 따른 해수 내 캐비테이션 특성 평가)

  • Jo, Chung-Hui;Park, Il-Cho;Kim, Seong-Jong
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2016.11a
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    • pp.146-146
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    • 2016
  • 최근 국민 소득향상과 더불어, 여가시간 증가에 따라 해양레저에 대한 관심이 크게 높아지고 있으며, 그에 따라 레저용 선박 수요도 증가하고 있다. 기존 국내 소형 선박의 경우 FRP(fiber-reinforced plastic)재료로 선박을 건조해 왔다. 그러나 해양환경 규제 강화로 FRP 선박의 건조가 감소하고 있으며, 친환경 선박에 대한 필요성이 대두되고 있다. 따라서 FRP재료를 대체하는 선박용 재료로 친환경적이고 가벼운 소재인 알루미늄 합금 재료가 선박건조 분야에서 각광을 받고 있다. 특히 5000계열 Al-Mg 합금은 가공성과 용접성이 우수하여 주로 구조용으로 많이 사용되고 있으나 경량화에 따른 빠른 선속이 유체충격을 증가시켜 선체에 캐비테이션 손상을 일으킬 수 있다. Al-Mg 합금의 경우에 부식성이 대단히 큰 해양환경에서 부식과 캐비테이션 침식이 복합적으로 일어나면 손상이 빠르게 증가되는 경향을 나타내어 선박의 수명을 현저히 단축시켜 경제적인 손실을 초래한다. 따라서 본 연구에서는 해수 내에서 Al-Mg 합금의 캐비테이션 저항성을 향상시키기 위해 알루미늄 합금 표면에 내식성 뿐만 아니라 경도 및 내마모성 등의 기계적 특성이 우수한 산화피막을 형성시키는 양극산화 기술을 적용하고, 다양한 봉공처리(sealing)방법에 따른 캐비테이션 특성을 평가하였다. 캐비테이션 실험은 압전(piezoelectric) 효과를 이용한 진동발생 장치를 사용하여 $30{\mu}m$ 진폭으로 일정하게 유지하였으며, 시편과 혼 팁 사이의 간격은 1mm로 하였다. 캐비테이션 실험 후에는 시편을 초음파 세척하여 진공 건조기에서 24시간 이상 건조한 후 정밀저울로 무게를 측정하였으며, 표면 손상 형상을 분석하기 위해 주사전자현미경(SEM)과 3D현미경을 이용하여 관찰하였다.

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Predictions of the deteriorating performance for the marine diesel engines (선박용 디젤기관의 열화성능 예측에 관한 연구)

  • Jung, Chan-Ho;Rho, Beom-Seuk;Lee, Ji-Woong;Choi, Jae-Sung
    • Journal of Advanced Marine Engineering and Technology
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    • v.37 no.1
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    • pp.47-52
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    • 2013
  • The higher energy efficiency for ship and the lower pollution for global environment are required strictly. However the performance of marine diesel engine is gradually deteriorated with time. And also the operation condition is varied with sea conditions. Hence the optimization for operating condition of marine engines is needed for energy saving and environment kindly. In this paper, it was attempted to investigate the influence of aging for marine diesel engine. The deterioration of engine performance is assessed by the calculation results of the simulation program for two-stroke marine diesel engine developed by author which was reported before. And three parameters for deterioration of engine performance were considered such as lower efficiency of turbocharger by fouling, increase of blow-by gas due to wear of cylinder liner and getting worse of combustion by poor injection. By the results, it was shown that the influence of engine performance by aging was relatively not so small - 10.4 bar low in Pmax and 3.2% decrease in Pmi.

Comparison of characteristics between cam and electric control type of 2 stroke diesel engine for ship propulsion (캠 및 전자제어식 선박추진용 저속 2행정 디젤엔진의 성능 비교)

  • Lee, Sang Deuk;Jung, Suk Ho;Koh, Dae Kwon
    • Journal of Advanced Marine Engineering and Technology
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    • v.37 no.8
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    • pp.849-854
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    • 2013
  • Many researches on green ship with increasing on economics, efficiency and convenience have been carried out consistently. One of them is development of diesel engines with electronic control. While small duty one for automobiles had been adopted mainly already, disseminating heavy duty one for ships has trouble due to safety and reliability. In order to solve these problem in this study, performance of electronic control and cam type engine installed in parallel on training ship HANBADA of korea maritime university was analyzed and compared. It is certain that specific fuel oil consumption of the electronic control type is lower than cam type and excellent at lower engine load, especially. And the electronic control type shows more effective characteristic at sea trial on specific fuel oil consumption.

A study on resistance & propulsion performance of a 9.77ton hybrid propulsion fishing boat (9.77톤 전기복합 추진어선 저항 추진성능에 관한 연구)

  • Young-Jae Jeong;Yeun-Hee Song;Hye-Young Kang;Kyoung-Wan Lee
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2023.11a
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    • pp.114-115
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    • 2023
  • Research on eco-friendly ships is being actively conducted due to the strengthening of environmental regulations in the shipping sector by the International Maritime Organization (IMO). However, most studies are on large ships, and research on small ships is insufficient. Since most fishermen operate small boats, research on eco-friendly fuel vessels is necessary. This study performed resistance performance analysis, model tests, and POW tests to develop a hybrid electric propulsion ship, and compared and verified the CFD and model test results.

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Active Front End Rectifier Control of DC Distribution System Using Neural Network (신경회로망을 적용한 직류배전시스템의 AFE 정류기 제어에 관한 연구)

  • Kim, Seongwan;Jeon, Hyeonmin;Kim, Jongsu
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.27 no.7
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    • pp.1124-1128
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    • 2021
  • As regulations of emissions from ships become more stringent, electric propulsion systems have been increasingly used to solve this problem in vessels ranging from large merchant ships to small and medium-sized ships. Methods for improving the efficiency of the electric propulsion system include the improvement of power sources; the use of a system linked to environmentally friendly power sources, such as batteries, fuel cells, and solar power; and the development of hardware and control methodology for rectifiers, power conversion devices, and propulsion motors. The method using a phase-shifting transformer with diodes has been widely used for rectification. Power semiconductor devices with grid connection to an environmentally friendly power source using DC distribution, a variable speed power source, and the application of small and medium-sized electric propulsion systems have been developed. Accordingly, the demand for active front-end (AFE) rectifiers is increasing. In this study, a method using a neural network rather than a conventional proportional-integral controller was proposed to control the AFE rectifier. Tested controller data were used to design a neural network controller trained through MATLAB/Simulink. The neural network controller was applied to a rectification system designed using PSIM software. The results indicated the effectiveness of improving the waveform and power factor DC output stage according to the load variation. The proposed system can be applied as a rectification system for small and medium-sized environmentally friendly ships.