• Title/Summary/Keyword: Fuel-cut

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A Study on Variable Speed Generation System with Energy Saving Function

  • Dugarjav, Bayasgalan;Lee, Sang-Ho;Han, Dong-Hwa;Lee, Young-Jin;Choe, Gyu-Ha
    • Journal of Electrical Engineering and Technology
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    • v.8 no.1
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    • pp.137-143
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    • 2013
  • This paper presents development of variable speed generation (VSG) system with energy saving function. The rubber tyred gantry crane (RTGC) requires the power from diesel-engine. Significant fuel savings by reducing the engine speed can be achieved, because all of operation modes except hoisting are required lower power than rated value of engine. When low speed operation output voltage of generator is decrease until acceptable range of motor driver inverters and auxiliary load supplier. According to power demand engine speed is varying from 20 to 60Hz, and voltage is varying between 210Vac and 480Vac. When idle mode or low power operation dc/dc converter operates by constant output voltage control and inverters dc site voltage is compensated by it. This paper proposed 3-phase interleaved boost converter which has the same structure as the commercially available 3-phase inverter and current sharing capability. 400kW interleaved converter is designed and a performance of converter is evaluated through several experiments with a RTGC system. Energy saving VSG system can cut down fuel consumption by 36% and 21.3% at idle and unidirectional load operations.

Jet A-1 Coking Tests under Conditions Simulating Gas Turbine Combustor (가스터빈 연소기 모사 조건에서의 Jet A-1 코킹시험)

  • Lee, Dain;Lee, Kangyeong;Han, Sunwoo;Ahn, Kyubok;Ryu, Gyong Won
    • Journal of the Korean Society of Propulsion Engineers
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    • v.26 no.1
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    • pp.1-11
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    • 2022
  • In a gas turbine, fuel is exposed to a high temperature environment until it is fed to the combustor through the injector. Hydrocarbon fuels can coke under high temperature conditions, which can cause coking material to deposit on fuel lines or block the injector passages. In this study, a specimen simulating a fuel line located inside a gas turbine and Jet A-1 were heated using electric devices. Jet A-1 coking tests were performed by changing the wall temperature of the stainless steel specimen and the temperature of Jet A-1 supplied to the specimen. After the coked specimens were cut, the coking material and the inner surface were analyzed using an energy dispersive X-ray spectrometer and a field emission scanning electron microscope.

The Study on the Space for Cooking and Dinning of Multi-family Housing at Yanji City in China. (중국 연변 조선족 집합주택의 취사 및 식사공간에 관한 연구)

  • 김종영
    • Journal of the Korean housing association
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    • v.13 no.2
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    • pp.65-71
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    • 2002
  • Recently, the space organization of Korean-Chinese houses is different from that of other territories. The characteristics of eating and dinning space for Korean-Chinese Multi-family Housing are as follows ; ⅰ) The most obvious change in Korean-Chinese urban housing style was seen in kitchen space, which can be classify three types such as traditional type, improved type, and LDK type on the bases of heating and cooking method. ⅱ) Special feature of Korean-Chinese housing in Yanji city was that kitchen fulfilled important functions such as heating, cooking, dinning, sleeping, bathing and washing. Since then, each function was separated and functions of kitchen were cut down after all. iii) The arrangement of kitchen space have changeed according to the change of heating fuel, heating system, equipment, relatcd policy, etx. Multi-function kitchen discovered only in Yanji had lasted until 1980's by equipping heating floor system, which is suitable for sit-down living style. In 1990's, this kitchen style was prohibited legally, and the balcony area of kitchen widened due to the abolition of outdoor storehouse for foodstuff.

Calculation of the air ratio in the case of firing gaseous fuels containing incombustibles

  • Cho, Kil-Won;Kunwoo Han;Park, Heung-Soo;Lee, Yong-Kuk;Lee, Kun-Hong
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • 1998.05a
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    • pp.43-48
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    • 1998
  • A short-cut equation for the calculation of the air ratio in the case of firing gases containing incombustibles has been derived on the basis of mass balances. The new equation requires the oxygen concentration and the amount of carbon dioxide in the combustion gas, theoretical oxygen and air requirements, and the content of incombustibles other than carbon dioxide in the fuel for the air ratio calculation. By using the equation, a theoretically correct calculation of the air ratio has been enabled.

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A Study on the Noise Property and its Reduction of the FCEV Blower (FCEV 블로워의 소음특성과 개선방향에 관한 연구)

  • Oh, Ki-Seok;Lee, Sang-Kwon;Seo, Sang-Hoon
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2007.11a
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    • pp.1419-1424
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    • 2007
  • Centrifugal turbo blower is requested highly efficiency and low noise in FCEV, but the noise generated by this machine causes of the most serious problems in the NVH performance. In general, centrifugal turbo blower is dominated by mechanical noise and aerodynamic noise. Mechanical noise is generated by rotation of the bearing, misalignment and unbalance. And aerodynamic noise is generated by the strong intersection between the flow discharged from the impeller and the cut-off in the casing. The first object of this study is to comprehend a noise property of the blower through the noise test. And, second object is to bring up the method that can reduce blower noise.

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Evaluation of a Bond Strength of Thermal Barrier Coating for Gas Turbine Blade (가스터빈 블레이드 열차폐 코팅의 접착강도 평가)

  • Kim, Dae-Jin;Lee, Dong-Hoon;Kim, Hyung-Ick;Kim, Mun-Young;Yang, Sung-Ho;Park, Sang-Yoel;Koo, Jae-Mean;Seok, Chang-Sung
    • Proceedings of the KSME Conference
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    • 2007.05a
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    • pp.195-199
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    • 2007
  • In this study, bond strength tests were performed for the thermal barrier coating applied to the 1st stage turbine blade. After the tests, the specimens were cut and the locations of failure were observed by using optical microscope. The influence of heat treatment on bond strength of a bond coating and the difference among the three types of bond coatings are treated.

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Review of Desulfurization Technology for Ultra Low Sulfur Diesel Production (초저황 디젤 생산을 위한 탈황 기술 동향)

  • Park, Jo-Yong;Kim, Jae-Kon;Yim, Eui-Soon;Jung, Choong-Sub
    • Journal of the Korean Applied Science and Technology
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    • v.30 no.3
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    • pp.431-443
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    • 2013
  • Sulfur content of diesel fuel has been cut down to under 10 ppm ULSD (ultra low sulfur diesel) level by environmental regulation with the aim of reducing exhaust emissions. This review discusses the methods and principles of sulfur reduction in diesel and presents an overview of new approaches for ultra-deep desulfurization. The deep HDS (hydrodesulfurization) problems of diesel streams is exacerbated by the inhibiting effect of co-existing aromatics, nitrogen compounds and $H_2S$. The new approaches to deep desulfurization includes non-HDS type processing schemes such as adsorptive, extractive and oxidative desulfurization.

A Study on the Noise Property and Its Reduction of the FCEV Blower (FCEV 블로워의 소음특성과 개선방향에 관한 연구)

  • Oh, Ki-Seok;Lee, Sang-Kwon;Seo, Sang-Hoon
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.18 no.5
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    • pp.516-523
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    • 2008
  • Centrifugal turbo blower is requested highly efficiency and low noise in FCEV, but the noise generated by this machine causes of the most serious problems in the NVH performance. In general, centrifugal turbo blower is dominated by mechanical noise and aerodynamic noise. Mechanical noise is generated by rotation of the bearing, misalignment and unbalance. And aerodynamic noise is generated by the strong intersection between the flow discharged from the impeller and the cut-off in the casing. The first object of this study is to comprehend a noise property of the blower through the noise test. And, second object is to bring up the method that can reduce blower noise.

Development of a shared remote control robot for aerial work in nuclear power plants

  • Shin, Hocheol;Jung, Seung Ho;Choi, You Rack;Kim, ChangHoi
    • Nuclear Engineering and Technology
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    • v.50 no.4
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    • pp.613-618
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    • 2018
  • We are developing a shared remote control mobile robot for aerial work in nuclear power plants (NPPs); a robot consists of a mobile platform, a telescopic mast, and a dual-arm slave with a working tool. It is used at a high location operating the manual operation mechanism of a fuel changer of a heavy water NPP. The robot system can cut/weld a pipe remotely in the case of an emergency or during the dismantling of the NPP. Owing to the challenging control mission considering limited human operator cognitive capability, some remote tasks require a shared control scheme, which demands systematic software design and integration. Therefore, we designed the architecture of the software systematically.

Study on synthesis of carbon nanomaterials by hydrogen mixing in counterflow methane diffusion flames (메탄 대향류 확산화염내 수소를 첨가한 탄소나노물질 합성에 관한 연구)

  • Shin, Woo-Jung;Choi, Jung-Sik;Yoon, Seok-Hun;Lee, Hyun-Sik;Choi, Jae-Hyuk
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2011.10a
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    • pp.88-89
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    • 2011
  • The study on synthesis of carbon nanomaterials by H2 mixing in counterflow methane diffusion flames has been experimentally conducted. We have also investigated on effect of catalyst and temperature in flame. The counterflow flame was formed by many kind of gas (fuel side using $CH_4-H_2-N_2$ and oxidizer side $N_2-O_2$) and nitrogen shields discharge on each other side to cut off oxidizer of the atmosphere. Ferrocene was used as a metal catalyst for CNTs synthesis. substrate was used to deposit carbon nanomaterials and these were analyzed by FE-SEM. We could find that carbon nanotubes and many kind of carbon nano materials were formed in Cu wire substrate, through this experiment.

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