• Title, Summary, Keyword: Thermal power generator

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A Study on the Relationship between Steam Generator Fouling and the Electric Power (증기발생기 파울링과 전기출력의 상관성 고찰)

  • Cho, Nam Cheoul;Shin, Dong Man;Kim, Yong Sik
    • Transactions of the Korean Society of Pressure Vessels and Piping
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    • v.13 no.2
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    • pp.31-37
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    • 2017
  • The heat transfer function or thermal performance is the most important function of the steam generator component in nuclear power plants. The declining of thermal performance, fouling does not affect the electric power of the nuclear power plant within a certain fouling level, but it affects the output when goes beyond the governor valve wide open of the turbine. The VWO steam pressure can be predicted through the thermal performance evaluation of steam generators in the nuclear power plant. In consideration of the fouling characteristics of the steam generator, methods of the thermal performance evaluation and fouling cases are reviewed, and also the critical VWO value is estimated through the actual thermal performance evaluation. It is necessary to apply the VWO theory based on the thermal performance of the steam generators.

SIMULATION OF THERMAL STRATIFICATION IN INLET NOZZLE OF STEAM GENERATOR

  • Ji, Joon-Suk;Youn, Bum-Su;Jeong, Hyun-Chul;Kim, Sang-Nyung
    • Nuclear Engineering and Technology
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    • v.41 no.3
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    • pp.287-294
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    • 2009
  • Due to thermal hydraulics phenomena, such as thermal stratification, various events occur to the parts of a nuclear power plant during their lifetimes: e.g. cracked and dislocated pipes and thermally fatigued, bent, and damaged supports. Due to the operational characteristics of the parts of the steam generator feedwater inlet horizontal pipe, thermal stratification takes place particularly frequently. However, the thermal stress due to thermal stratification at the steam generator feedwater inlet horizontal pipe was not reflected in the design stage of old plants(Kori Unit No.1, 2, 3 and 4, Yeonggwang Unit No. 1 and 2, and Uljin Unit No. 1 and 2; referred to as old-style power plants hereinafter). Accordingly, a verification experiment was performed for thermal stratification in the horizontal inlet nozzle steam generator of old-style plants. If thermal stratification occurred in the horizontal pipe of an old-style power plant, numerical analysis of the temperature distribution of the pipes and fluids was conducted. The temperature distributions were compared at the curved part of the pipe and the horizontal pipe before and after the installation of the improved thermal sleeves designed to alleviate thermal stress due to thermal stratification. The thermal stress reduction measure was proven effective at the steam generator inlet horizontal pipe and the curved part of the pipe.

Development of Intelligent Digital Governor System for Steam Turbine Generator in Buk-Cheju Thermal Power Plant (북제주 화력 발전소 스팀 터빈 발전기용 인텔리전트 디지털 조속기 개발)

  • 전일영;하달규;신명철;김윤식
    • Proceedings of the KIPE Conference
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    • pp.608-613
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    • 1999
  • This thesis aims at developing of a digita governor system for the steam turbine generator on the Buk-Cheju Thermal Power Plant of KEPCO. The steam turbine generator of the Buk-Cheju Thermal Power Plant is modelled. As a hardware platform, a triple modular system which is fitted 32-bit microprocessor of Motorola company to perform the digital governor system is used. The parameters of the PID controller algorithm in the speed control block is tuned on the basis of the estimated model.

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Design and Fabrication of a Thermoelectric Generator Based on BiTe Legs to power Wearable Device

  • Moon, S.E.;Kim, J.;Lee, S.M.;Lee, J.;Im, J.P.;Kim, J.H.;Im, S.Y.;Jeon, E.B.;Kwon, B.;Kim, H.;Kim, J.S.
    • Journal of the Korean Physical Society
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    • v.73 no.11
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    • pp.1760-1763
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    • 2018
  • To attain power generation with body heat, the thermal resistance matched design of the thermoelectric generator was the principal factor which was not critical in the case of thermoelectric generator for the waste heat generation. The dimension of thermoelectric legs and the number of thermoelectric leg-pairs dependent output power performances of the thermoelectric generator on the human wrist condition was simulated using 1-dimensional approximated heat flow equations with the temperature dependent material coefficients of the constituent materials and the dimension of the substrate. With the optimum thermoelectric generator design, thermoelectric generator modules were fabricated by using newly developed fabrication processes, which is mass production possible. The electrical properties and the output power characteristics of the fabricated thermoelectric modules were characterized by using a home-made test set-up. The output voltage of the designed thermoelectric generator were a few tens of millivolts and its output power was several hundreds of microwatts under the conditions at the human wrist. The measured output voltage and power of the fabricated thermoelectric generator were slightly lower than those of the designed thermoelectric generator due to several reasons.

Development of Generator Excitation System with Main/Standby Controller in In-chun Thermal power plant #4 (인천화력 4호기 발전기용 주/부 제어기를 갖는 정지형 여자시스템 개발)

  • 류호선;임익헌
    • Proceedings of the KIPE Conference
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    • pp.407-410
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    • 1999
  • Potential-source controlled excitation system had been developed for synchronous generator in In-Chun thermal power plant #4 by KEPRI. This paper describes the characteristics of Main/Standby control system employed analog, digital circuit devices (hybrid type) and 3 PCRs(Phase Controlled Rectifier)

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Analysis of Effective Soil Thermal Conductivities and Borehole Thermal Resistances with a Power Supply Regulation (부하변동에 의한 지중유효열전도도와 보어홀 전열저항 해석)

  • Ro, Jeong-Geun;Yon, Kwang-Seok;Song, Heon
    • Journal of the Korean Solar Energy Society
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    • v.31 no.4
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    • pp.80-86
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    • 2011
  • Investigation of the effective soil thermal conductivity(k) is the first step in designing the ground loop heat exchanger(borehole) of a geothermal heat pump system. Another important factor is the borehole thermal resistance($R_b$). Thermal response tests offer a good method to determine the ground thermal properties for the total heat transport in the ground. This is done by supplying a constant heat power into a borehole heat exchanger. There are two methods to supply a constant heat power. One is to employ the electricity provided by Korea Electric Power Corporation(KEPCO). The other is to use electricity generated by a generator. In this study, the power supply regulation was found to reduce when the electricity generated by the generator was used. This is because the generator evaluated with the power supply characteristically reduces the power supply regulation between an overload and a complex using. But it sometimes occurs a power supply regulation in In-situ thermal response test. In this case getting of k,$R_b$ requires delay times and restored normal state. However, the effect of the delay times and restored normal state on the soil thermal conductivity and borehole thermal resistance is very small. Therefore it is possible to use a generally accepted delay times and restored normal state in the analysis. In this work, it is also shown that an acceptable range of ${\Delta}k$, ${\Delta}R_b$ for normal state and regulation state might be approximately 0.01-0.16W/m k, and -0.004-0.007m K/W, respectively. Thus, restored normal state of power supply regulation is valuable to recommend.

Thermal-Hydraulic Analysis Methodology of Nuclear Power Plant Steam Generator (원전 증기발생기 열유동 해석법)

  • Choi Seok-Ki;Kim Seong-O;Choi Hoon-Ki
    • Journal of computational fluids engineering
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    • v.7 no.2
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    • pp.43-52
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    • 2002
  • This paper presents the numerical methodology of ATHOS3 code for thermal hydraulic analysis of steam generators in nuclear power plant. Topics include porous media approach, governing equations, physical models and correlations for solid-to-fluid interaction and heat transfer, and numerical solution scheme. The ATHOS3 code is applied to the thermal hydraulic analysis of steam generator in the Korea Kori Unit-1 nuclear power plant and the computed results are presented

A comparison of speed control of various turbines according to power plant types (발전방식별 여러 가지 터빈의 속도제어 비교)

  • Choi, I.K.;Jeong, C.K.
    • Proceedings of the KIEE Conference
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    • pp.2314-2316
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    • 2001
  • The steam gererator which produces thermal energy from coal or gas is a very important device in power plants, including the turbine driving synchronous generator which transforms kinetic energy into electrical energy. The turbine and the generator are driven by many kinds of media according to the types of which power plants are classified into steam turbine generator, gas turbine generator, water turbine generator and so on. This paper introduces the overspeed protection as well as the various speed and load control methods of some types of turbines.

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Fundamental Study of Energy Harvesting using Thermoelectric Module on Road Facilities (열전소자를 활용한 도로구조물에서의 에너지 하베스팅 기초 연구)

  • Lee, Jae-Jun;Kim, Dae-Hoon;Lee, Kang-Hwi;Lim, Jae-Kyu;Lee, Seung-Tae
    • International Journal of Highway Engineering
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    • v.16 no.6
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    • pp.51-57
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    • 2014
  • PURPOSES : An conventional method for electric power generation is converting thermal energy into mechanical energy then to electrical energy. Due to environmental issues such as global warming related with $CO_2$ emission etc., were the limiting factor for the energy resources which resulting in extensive research and novel technologies are required to generate electric power. Thermal energy harvesting using thermoelectric generator is one of energy harvesting technologies due to diverse advantages for new green technology. This paper presents a possibility of application of the thermoelectric generator's application in the direct exchange of waste solar energy into electrical power in road space. METHODS : To measure generated electric power of the thermoelectric generator, data logger was adopted as function of experimental factors such as using cooling sink, connection methods etc. Also, the thermoelectric generator、s behavior at low ambient temperature was investigated as measurement of output voltage vs. elapsed times. RESULTS : A few temperature difference between top an bottom of the thermoelectric generator is generated electric voltage. Components of an electrical circuit can be connected in various ways. The two simplest of these are called series and parallel and occur so open. Series shows slightly better performance in this study. An installation of cooling sink in the thermoelectric generator system was enhanced the output of power voltage. CONCLUSIONS : In this paper, a basic concepts of thermoelectric power generation is presented and applications of the thermoelectric generator to waste solar energy in road is estimated for green energy harvesting technology. The possibility of usage of thermoelectric technology for road facilities was found under the ambient thermal gradient between two surfaces of the thermoelectric module. An experiment results provide a testimony of the feasibility of the proposed environmental energy harvesting technology on the road facilities.

A Study on ASM Pulsed Power Generator for Non-thermal Plasma Applications (저온 플라즈마 발생을 위한 ASM 방식의 펄스파워 발생장치에 관한 연구)

  • Yang, Chun-Suk;Chung, Yong-Ho;Kim, Han-Joon
    • Proceedings of the KIEE Conference
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    • pp.2035-2037
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    • 1999
  • This paper describes an ASM(All Solid-state Modulator) pulsed power generator for non-thermal plasma applications. The proposed generator can produce 20kV, 500A, 100ns pulses at repetition rates up to 10kHz, and it is composed of 30 series connections of power circuit card assembly which contains paralleled MOSFETs, MOSFET drivers, energy storage capacitors and specially designed 1:1 pulse transformer. Higher pulse voltages and currents can easily be obtained by increasing the numbers of series and parallel connections of power circuit card and MOSFETs, respectively. Component layouts are optimized to minimize the leakage inductance and the voltage spikes across switching devices. Especially it put emphasis on the over-current protection (including short circuit) for the reliable operation in real situations. Experimental results show that the proposed pulser is very efficient in air pollution control application and could be useful for other applications such as synthesis of nanosize powders and non-thermal food processing.

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