• Journal of Advanced Marine Engineering and Technology
• /
• v.39 no.7
• /
• pp.716-721
• /
• 2015

As the severity of environmental pollution has increased, restrictions on air pollution have been strengthened. Stringent regulations have been imposed, not only on marine diesel engines but also on automotive and industrial power plants. Thus, biofuels have been directly applied in practical engines and used in training ships for basic research. Even though a high biofuel percentage cannot be used in a training ship engine for safety reasons, because this type of engine is larger than those used in institutional laboratories, the results will provide important basic information that will allow organizations to determine the status of a large output. Biodiesel fuel was studied to determine how it would affect the combustion characteristics and exhaust emissions of a marine diesel generator engine. The main results can be summarized as follows. Because the physical and chemical compositions of biofuels are similar to those of diesel fuel, it was found that their practical use was possible in a training ship. The specific fuel consumption and NOx increased, whereas a tendency was found for carbon monoxide and soot to decrease. In addition, no significant pressure change difference was found between the diesel fuel and biofuels.

• Journal of Advanced Marine Engineering and Technology
• /
• v.39 no.4
• /
• pp.412-417
• /
• 2015

The IMO MEPC has been increasingly strengthening the emission standard for marine environment protection. In particular, nitrogen oxide (NOx) emissions of all ocean-going ships built from 2016 will be required to comply with the Tier-III regulation. In this study, a vanadia based SCR (Selective Catalytic Reduction) system developed for ship application was installed on a diesel engine for power generation of the training ship T/S SAENURI in Mokpo National Maritime University. For the present study, the exhaust pipeline of the generator diesel engine was modified to fit the urea SCR system. This study investigated the NOx reduction performance according to the two kind of injection method of urea solution (40%): Auto mode through the PLC (Programable Logic Control) and Manual mode. We were able to find the ammonia slip conditions when in manual mode method. So, the optimal urea injection quantity can be controlled at each engine load (25, 35, 50%) condition. It was achieved 80% reduction on nitrogen oxide. Furthermore, we found that the NOx reduction performance was better with the load up-down (while down to 25% from 50%) than the load down-up (while up to 50% from 25%) test.

• Proceedings of the KIPE Conference
• /
• 2011.07a
• /
• pp.66-67
• /
• 2011

하이브리드 발전 시스템에서 전압과 주파수제어는 서로 다른 분산전원의 동기화 및 전력제어에 있어 매우 중요하다. 본 논문에서는 하이브리드 시스템 디젤 발전기의 연료 분사량을 조절하는 액추에이터의 전류제어를 위한 디지털 Governor의 제어 알고리즘을 구현하고, 제어기 개발을 통해 부하 가변 시에도 안정된 주파수 값을 얻어내어, 발전기의 운전영역에서 안정된 속도제어가 이루어지는 가를 시뮬레이션을 통해 검증하였다.

• Journal of Power System Engineering
• /
• v.11 no.3
• /
• pp.3-8
• /
• 2007

The emergency AC power supply system of the nuclear power plant is designed to supply the power to the nuclear reactor at the emergency operating condition. The safety function of the diesel generator at the nuclear power plant is to supply AC electric power to the plant safety system whenever the preferred AC power supply is unavailable. The reliable operation of onsite emergency diesel generator should be ensured by a conditioning monitoring system designed to maintain and monitor and forecast the reliability level of diesel generator. To do this kind of diesel generator condition monitoring we reviewed several operating factors and history of the wolsong unit 3 diesel generator and selected the proper conditioning monitoring operating factors.

• Journal of Power System Engineering
• /
• v.13 no.1
• /
• pp.53-58
• /
• 2009

The emergency diesel generator(EDG) of the nuclear power plant is designed to supply the power to the nuclear reactor on Station Black Out(SBO) condition. The operation reliability of onsite emergency diesel generator should be ensured by a conditioning monitoring system designed to monitor and analysis the condition of diesel generator. For this purpose, we have developing the technologies of condition monitoring for the wolsong unit 3&4 standby diesel generator including diesel engine performance. In this paper, technologies of condition monitoring for the wolsong standby diesel generator are described about three step. First is for selection of operating parameter for monitoring. Second is for technologies of online condition monitoring, Third is for monitoring of engine performance.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2012.04a
• /
• pp.231-231
• /
• 2012

엔진의 상태진단을 위하여 사용되는 진동 및 초음파 신호는 진동 가속도계와 초음파변환기를 대상 엔진의 취약 부위에 부착하여 측정한다. 이들 센서는 연소와 관련된 고주파진동을 측정하는 능력이 있어서 사용되고 있다. 진동가속도계와 초음파변환기의 선정 및 설치는 진동해석에서 가장 중요한 결정 요소이다. 가속도계의 설치도 주파수응답에 영향을 준다. 초음파변환기는 전자기계적 변환기로서, 진동면에서 발생하여 공기 중으로 전파되는 음파를 감지한다. 초음파변환기는 사용할 수 있는 주파수대역이 아주 협소한 대신 가속도계보다 명확한 신호를 산출한다. 초음파변환기는 사용할 수 있는 아주 협소한 주파수역을 갖는 비용으로 가속도계보다 명확한 신호를 얻을 수 있다. 따라서 본 논문에서는 원전 비상디젤발전기 엔진 상태진단을 위한 초음파 및 진동센서의 설치방법에 따른 가속도계 및 초음파 센서의 응답 특성을 분석하고 주파수응답에 대한 영향에 따라 여러 가지 설치방법의 검토를 통하여 최적방법론을 도출한 결과를 소개하고자 한다.

• Proceedings of the KIEE Conference
• /
• 2015.07a
• /
• pp.689-690
• /
• 2015

국내 최초 원전인 고리1호기는 지난 2007년 30년의 운전수명을 마친 뒤 정부의 안전점검을 거쳐 10년간 연장운전에 들어갔다. 이 과정에서 원전의 비상 전원 계통 신뢰성 확보를 위해 설계수명을 초과한 35년 된 노후 비상디젤발전기(Emergency Diesel Generator, 이하 EDG)를 지난 2013년 4월부터 9월까지 약 6개월에 걸쳐 교체하게 되었으며, 국내 원전 EDG 총 42대 중 18대가 20년 넘게 운영되고 있고, 2025년까지 고리 1호기를 후속으로 월성1호기, 고리2호기, 고리3호기, 고리4호기, 한빛1호기 순으로 40년 승인된 운전 인허가 기간이 만료된다.[1]. 본 연구에서, Class 1E EDG 교체 시 신규 EDG 설계기준, 용량결정, 해석 및 평가에 대한 기술적 방법들을 고리1호기의 사례를 통해 고찰하였다.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2014.10a
• /
• pp.294-297
• /
• 2014

A Shipboard power system consists of three or four diesel generator sets connected to a grid. In case of dual fuel diesel generator sets employed LNG ship as a prime mover, large amounts of electricity are required for electric propulsion, auxiliary machinery and accommodation facilities. The electrical connection between generators through a network, torsional vibration can lead power swings. In this paper, the influence on the network by the torsional vibration of diesel generator sets in grid operation were studied. The torsional vibration characteristics were investigated and analyzed through theoretical analysis and the vibration measurement and the results were presented.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2005.05a
• /
• pp.648-655
• /
• 2005

The resilient mounts of a diesel engine installed onboard a ship should be designed for both static and dynamic loads. If possible, the resonance frequencies of the six rigid body modes of the installation and the flexible modes of the engine support structure should not lie within the engine operation range. In this paper a design criterion is proposed to evaluate an isolation system which involves the summation of dynamic forces transmitted through the resilient mounts and elastic potential energy index stored in the mounts. A case study is also presented in which a diesel engine generator, which had an elastic foundation and was mounted in a 5500 TEU container vessel, was studied both theoretically and experimentally. The theoretical analysis of the test model was performed by using a single mass 6 degree of freedom system. Actual measurements of mechanical vibration of the Engine and its foundation onboard were carried out, which showed the importance of including the flexibility of the engine support structure in the mode

• Transactions of the Korean Society for Noise and Vibration Engineering
• /
• v.16 no.4 s.109
• /
• pp.329-338
• /
• 2006

The resilient mounts of a diesel engine installed onboard a ship should be designed for both static and dynamic loads. If possible, the resonance frequencies of the six rigid body modes of the installation and the flexible modes of the engine support structure should not lie within the engine operation range. In this paper a design criterion is proposed to evaluate an isolation system which involves the summation of dynamic forces transmitted through the resilient mounts and elastic potential energy index stored in the mounts. A case study is also presented in which a diesel engine generator, which had an elastic foundation and was mounted in a 5500 TEU container vessel, was studied both theoretically and experimentally. The theoretical analysis of the test model was performed by using a single mass 6 degree of freedom system. Actual measurements of mechanical vibration of the engine and its foundation onboard were carried out, which showed the importance of including the flexibility of the engine support structure in the mode.