• Title/Summary/Keyword: 펌프 제어

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The Development of Feed-Water Flow Controller of Boiler Feed-Water Pump in 500MW Class Coal-Fired Power Plant (500MW급 석탄화력발전소 보일러 급수펌프 유량 제어기 개발)

  • Lim, Geon-Pyo;Choi, In-Kyu;Park, Doo-Yong;Jeong, Tae-Won;Kim, Gun-Jung
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.9
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    • pp.1663-1672
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    • 2010
  • The boiler feed-water pump controllers which can be applied to 500MW class coal fired power plants was developed. The validity of the developed controllers was shown via the applied test result in a power plant. It is expected that the developed controllers are used to retrofit the existing controllers that have surpassed their expected service life and have limited spare parts, and contributes to the stable operation of plants. Based on the collected data and analysis, new control schemes were developed and implemented during the overhaul period in the new control systems. During normal operation, feed water could be supplied to the boiler with the capability of the 1600t/h flow without any problems in automatic mode of controllers. In this study, the feed-water pump controllers were developed successfully. In addition, it is expected that the developed controllers can make the plant operation more stable and can be applied to a lot of power plants.

Burner combustion characteristics of hybrid type water mixing emulsion fuel (하이브리드형 물혼합 에멀젼 연료의 버너 특성)

  • Kim, Cheol-Jeong;Kim, Dong-Kwon;Park, Kweon-Ha
    • Journal of Advanced Marine Engineering and Technology
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    • v.37 no.4
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    • pp.308-315
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    • 2013
  • Water emulsion technology has the problem of unstable combustion due to the rapid separation of water. To solve the problem, a hybrid mixing device was developed. The device attached on the burner was tested. As a result, the fuel consumption reduced to 12% in the similar condition of exhaust emissions and flame temperature, and 45.5%, 98.5% and 97.2% of NOx, CO, and smoke were reduced at the same inlet air and fuel flow rate.

A Development of Digital Control System for FWPT In Nuclear Power Plant (원전 급수펌프 구동용 터빈 제어시스템 개발)

  • Choi, In-Kyu;Jeong, Chang-Ki;Kim, Byoung-Chul;Kim, Jong-An;Woo, Joo-Hee
    • Proceedings of the KIEE Conference
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    • 2006.07d
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    • pp.1885-1886
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    • 2006
  • The thermal energy from nuclear fission is transferred to the steam generator which is a kind of a large heat exchanger. After the feedwater is injected into the steam generator and absorbs the thermal energy, it is converted into the steam. This steam goes into the turbine. The balance between the generated energy and the consumed energy is required for the nuclear power plant to be stable. For the purpose of which, the feed water, a parameter for energy transfer, should be controlled in stability. Usually, the nuclear power plants are operated in base load in the view of power system for the stability of fission system. Therefore, though there will be almost no unbalance, there can be some instability from unbalance in case of startup/shutdown or disturbance. In this case, the controllability of feedwater pump is very important for the quick recover of stability.

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화력발전소 CWD(Cooling Water Discharge)를 활용한 해양소수력 개발의 기술적인 고찰(화력발전소 CWD와 조위특성과의 Harmony)

  • Eom, Bok-Jin
    • 열병합발전
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    • s.69
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    • pp.15-20
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    • 2009
  • 소수력 계획 시 개발지점에 대하여 수많은 자료와 정보 등을 필요로 하게 되는데 특히 해당지역내의 유량분포에 대한 유황자료는 개발의 판단여부를 결정케 하는 중요한 요소이다. 소수력발전소의 설비용량에 직접 관계되는 설계유량의 결정과 재해방지를 위한 유출의 예측을 가능케 하고 발전소운영 시 가동률 및 경제성에도 직접적인 영향을 미치는 중용한 요소이나 여기서 논하는 소수력개발은 하천이나 댐과 같은 유형이 아니라 일정한 유량을 확보하여 배출하기 때문에 문제는 없다. 그러나 계절별 부하에 따른 냉각수량의 변화 및 소수력 발전유량의 변동, 조위(해수면) 변화 등에 따라 달라진다. 그러므로 수위조절을 위한 수문은 이들의 변화에 따라 자동운전이 가능해야 하지만 운전시 발전정격수위를 맞출 수 있도록 수문을 조절한 다음 Turbine Governor에 의해 유량 및 수위를 제어할 수 있도록 설계하여 냉각수 순환수 계통에 영향이 미치지 않게 언제나 적정수위를 유지시킬 수 있는 운전모드로 구축하는 것이 안정이라 볼 수 있다. 소수력발전설비 및 수문의 오작동 및 고장이 발생할 때 수위가 상승하여 냉각계통에 손실수두 증가, 취수펌프의 양정고 증가와 Surge 발생 등으로 발전소의 정상 운전에 미치는 영향이 없어야 하므로 세밀한 검토가 필요하기 때문에 폐쇄시간과 수압상승 값 등 요인 분석후 설계하여야 한다. Figure A와 같이 국내 화력발전단지에서 냉각수로 사용되고 방류되는 해수는 발전소에 따라 ca.70~150 CMS로 ca.2,000~5000 kW 이상의 수력에너지(H=4m 형성 기준)를 보유하고 있으나, 현재 활용되지 못하고 그대로 해양으로 방류되고 있어 이 수력에너지의 개발 방안을 오래전부터 검토하여 왔다. 발전소 온배수의 원활한 배수를 위한 설계 낙차와 함께 남서해안의 조위변화에 따른 낙차를 이용하는 것으로 소수력 발전 방식과 조력발전 방식의 특징을 동시에 활용할 수 있다.

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Characteristics of the Sealing Pressure of a Magnetic Fluid Shaft Seal for Intra-Cardiac Axial Flow Blood Pumps (심장 내 이식형 축류 혈액 펌프용 자성 유체 축봉의 내압 특성)

  • KIM, Dong-Wook;Mitamura , Yoshinori
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.51 no.10
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    • pp.477-482
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    • 2002
  • One of the key technologic requirements for rotary blood pumps is the sealing of the motor shaft. A mechanical seal, a journal bearing, magnetic coupling, and magnetic suspension have been developed, but they have drawbacks such as wear, thrombus formation, and power consumption. A magnetic fluid seal is durable, simple, and non power consumptive. Long-term experiments confirmed these advantages. The seal body was composed of a Nd-Fe-B magnet and two pole pieces; the seal was formed by injecting magnetic fluid into the gap (50μmμm) between the pole pieces and the motor shaft. To contain the ferro-fluid in the seal and to minimize the possibility of magnetic fluid making contact with blood, a shield with a small cavity was attached to the pole piece. While submerged in blood, the sealing pressure of the seal was measured and found to be 31kPa with magnetic fluid LS-40 (saturated magnetization, 24.3 KA/m) at a motor speed of 10,000 rpm and 53kPa under static conditions(0mmHg). The specially designed magnetic fluid seal for keeping liquids out is useful for axial flow blood pumps. The magnetic fluid seal was incorporated into an intra-cardiac axial flow blood pump.

Evacuation characteristic measurement of anti-suck back centering by mini vacuum system (미니 진공시스템을 이용한 역류방지 센터링의 배기 특성 측정)

  • Hong, Gwang-Gi;Go, Seok-Il;Do, U-Ri;Yang, Won-Gyun;Ju, Jeong-Hun
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2009.05a
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    • pp.255-256
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    • 2009
  • The anti suck back centering (ASBC) for preventing backflow of oil for oil rotary pump was designed in the power failure. To evaluate the evacuation characteristics, we manufactured the mini vacuum system, personal computer, AD converter (National instrument, NI-6009), and automatic controller with touch panel for a basis. In this study, we measured the evacuation characteristics of ABSC and analyzed the flow field of viscous flow regime using a commercial software, CFD-ACE+. Also, the leakage of the advaced ASBC for leveling was measured.

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Development of Fuel Cell Power System for Unmanned Aerial Vehicle (무인 항공기용 연료 전지 동력 시스템 개발)

  • Kim, Tae-Gyu;Shim, Hyun-Chul;Kwon, Se-Jin
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2007.04a
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    • pp.87-90
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    • 2007
  • Fuel cell power system was developed for high-endurance unmanned aerial vehicle (UAV). Liquid chemical hydride was selected as a fuel due to its high energy density. Liquid storage of the fuel is an ideal alternative solution of the existing compressed hydrogen storage. The fueling system that extracts hydrogen from chemical hydride consists of catalytic reactor, micro-pump, fuel cartridge, separator, and controller. The fuel cell power system including the fueling system and the fuel cell that generates electricity was integrated into a proposed UAV. The performance verification of the fuel cell power system was performed to use as a power plant of the UAV.

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Development of the Oil Consumption Rate Test Method and Measurement Data Analysis for an Automatic Transmission System (자동변속기 오일 소요유량 시험법개발 및 측정데이터 분석)

  • Jeong, H.S.;Oh, S.H.;Yi, J.S.;Lim, J.S.
    • Transactions of The Korea Fluid Power Systems Society
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    • v.6 no.1
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    • pp.10-16
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    • 2009
  • Automatic power transmission systems consisted of a torque converter and several planetary gear sets, clutches and brakes are controlled by a hydraulic shift control circuit and an electronic transmission control unit. The hydraulic circuit serves for the operation of the torque converter and lubrication oil supply of the transmission system as well as for the actuation of clutches for the automatic gear shift. The complicated hydraulic control circuit constructed by many spools, solenoids, orifices and flow passages are integrated into one small valve block and it is powered by one hydraulic pump. In this paper, a test equipment was developed to measure the oil consumption of each component at various wide operating conditions. Test data about 730 sets acquired from five test items are analyzed and discussed on the oil capacity of the circuit.

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Instrument of building outer wall window cleaning robot and controller layout that use vacuum adsorption technology (진공흡착 기술을 사용한 건물외벽 유리창 청소 로봇의 구현)

  • Lee, Dong-Kwang;Kim, Myung-Jong;Kwon, Soon-Won;Choi, Mun-Sik;Im, Young-Hoon;Kong, Jung-Shik;Jang, Mun-Suk;Kwon, Oh-Sang;Lee, Eung-Hyuk
    • Proceedings of the KIEE Conference
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    • 2007.10a
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    • pp.259-260
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    • 2007
  • 본 논문은 건물 외면의 유리창 청소로봇에 관한 것으로, 더욱 세부적으로는 청소 시스템을 갖춘 로봇을 사람이 닦기 힘들거나 위험한 고층건물이나 아파트 둥의 실외 유리창에 흡착시켜 청소로봇을 이용하여 실외 유리창을 자동으로 닦을 수 있게 하는 건물 외면의 유리창 청소로봇에 관한 것이다. 진공펌프를 사용하여 유리창에 안정적으로 흡착할 수 있도록 하였고, 블루투스를 이용하여 무선 조종이 가능하도록 하여 사용자가 원거리에서 로봇의 청소를 제어할 수 있도록 하였다.

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An Introduction to Speed Control System of Small Steam Turbine for Feed Water Supply in Power Plant (발전소 급수펌프 구동용 소형 터빈 제어시스템 소개)

  • Choi, In-Kyu;Kim, Jong-An
    • Proceedings of the KIEE Conference
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    • 2007.07a
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    • pp.1603-1604
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    • 2007
  • The load of power plants changes every from time to time according to which steam flow of boiler changes. the feed water control is very important for the power plant to be operated in its stability conditions. In case of circulation type boiler, the instability of feed water control leads to instability of drum level control. The higher level of drum water can induce bad quality steam to go into turbine which means the possibility of damage. The lower level of drum water can induce the tubes of boiler water wall to be overheated. In case of once through type boiler, the instability of feed water control leads to bad cooling of superheaters. The less the feed water flow is, the more heated the superheater is. It is necessary for the turbine driving feed water pump to be controlled for the optimal feed water flow in the large capacity power plant. The speed of turbine is controled for the feed water flow. By the way, the optimal control of steam valve is necessary for the speed control of turbine. Therefore, the various kinds of the steam valve structures are introduced in this paper

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