• Title, Summary, Keyword: Cooling water leakage

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A Study on the Automatic Sensing Device for Gas Leakage of Cooling Plate Using the Microprocessor System

  • Wang, Jee-Seok;Yoon, Hee-Jong;Kang, Ki-Seong;Kim, Jong-Do
    • Journal of Advanced Marine Engineering and Technology
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    • v.35 no.3
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    • pp.329-334
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    • 2011
  • The cooling water circulation plates had been used to drop the temperature of refractory outside shell of common cooling system by using cooling plate or stave type. When they are attacked by surrounding gas, they are corroded and the water flows in the refractory due to leakage of water. So, the life of refractory material is shortened and changed due to the worse conditions of cooling system. The automatic sensing device for water leakage of cooling plate is developed to check the position of trouble by using the microprocessor system when cooling water leak and gas are flowed into the cooling plate through the leakage position. The flowed gas is detected in the micro-process system which delivers the detected position of cooling plate or stave to main control room through the wireless-radio relay station. This system can be possible to detect the position of cooling plate or stave against the water leakage part immediately and then deliver the signal to main control room by using the microprocessor system and wireless-radio relay station. This system will be developed in changing the working condition from manual system to unmanned auto alarm system.

Electrical Properties of Wet Bars in Water-cooled Generator Stator Windings (흡습된 수냉각 발전기 고정자 권선의 전기적 특성)

  • Kim, Byeong-Rae;Kim, Hee-Dong
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.25 no.10
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    • pp.817-823
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    • 2012
  • Insulation breakdown of water-cooled generator stator windings occurs frequently due to leakage of cooling water and absorption into the insulation material. Leakage and absorption problems of water-cooled stator windings are often found during regular preventive maintenance. To evaluate cooling water leakage and absorption, diagnostic tests were performed on two water-cooled turbine generators, which have been in service for 13 and 17 years, respectively. The test results of the measured electrical properties such as dissipation factor($tan{\delta}$), capacitance and AC leakage current for water-cooled generator stator windings with wet bars are reported in this paper.

A Study on Automatic Sensing Device for Water Leakage of Cooling Pipe at Blast Furnace by Use The Electronic System (전자제어 장치를 이용한 용광로 냉각관 누수 지동 감지장치 개발에 관한 연구)

  • Kang, Chang-Soo;Kang, Ki-Seong
    • 전자공학회논문지 IE
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    • v.46 no.4
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    • pp.25-30
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    • 2009
  • The cooling water circulation pipes had been used to drop the temperature of refractory outside shell of blast furnace by cooling plate or stave type. They were attacked by surrounding CO gas and it was the cause that they were corroded and the water inflow in the refractory due to leakage of water. So, the life of refractory material was shorten and changed for the worse the conditions of blast furnace. The automatic sensing device for water leakage of cooling pipe was developed to check the position of trouble by use the micro-process system when cooling water leak and then CO gas will be inflowed into the cooling pipe at the leakage position. The inflowed CO gas will be detected in the micro-process system and delivered the detected position of cooling plate or stave to main control room through the wireless-radio relay station. This system can be possible to detect the position of cooling plate or stave the water leakage part immediately and then deliver the signal to main control room by use the micro-process system and wireless-radio relay station. This system will develop the working condition from manual system to unmanned auto alarm system.

An Experimental Study on Fault Detection and Diagnosis Method for a Water Chiller Using Bayes Classifier (베이즈 분류기를 이용한 수냉식 냉동기의 고장 진단 방법에 관한 실험적 연구)

  • Lee, Heung-Ju;Chang, Young-Soo;Kang, Byung-Ha
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.20 no.7
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    • pp.508-516
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    • 2008
  • Fault detection and diagnosis(FDD) system is beneficial in equipment management by providing the operator with tools which can help find out a failure of the system. An experimental study has been performed on fault detection and diagnosis method for a water chiller. Bayes classifier, which is one of classical pattern classifiers, is adopted in deciding whether fault occurred or not. Failure modes in this study include refrigerant leakage, decrease in mass flow rate of the chilled water and cooling water, and sensor error of the cooling water inlet temperature. It is possible to detect and diagnose faults in this study by adopting FDD algorithm using only four parameters(compressor outlet temperature, chilled water inlet temperature, cooling water outlet temperature and compressor power consumption). Refrigerant leakage failure is detected at 20% of refrigerant leakage. When mass flow rate of the chilled and cooling water decrease more than 8% or 12%, FDD algorithm can detect the faults. The deviation of temperature sensor over $0.6^{\circ}C$ can be detected as fault.

Characteristics of Water Leakage from Cooling Components in a Storage Ring (방사광 차단용 진공부품의 냉각수 누설 특성)

  • Park, C.D.
    • Journal of the Korean Vacuum Society
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    • v.17 no.1
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    • pp.1-8
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    • 2008
  • We analyzed the characteristics of water leakage from cooling components of the storage ring in the Pohang Light Source. The water leaks led localized pressure bumps and abnormal pressure changes. The leakage also changed the residual gas compositions depending not only on the position between leakage place to gas analyzer but also on on/off switching of ion pump and electron beam. We found that the residual gas analysis of $CH_4$, CO, NO was useful in determining water leaks.

Improvement of Cooling Water Quality by Corrosion and Scale Inhibitor (부식 및 스케일 억제제에 의한 냉각수 수질향상)

  • Jo, Kwan-Hyung;Woo, Dal-Sik;Hwang, Byung-Gi
    • Journal of Environmental Science International
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    • v.18 no.2
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    • pp.187-195
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    • 2009
  • This study was investigated to control the corrosion and scale at the cooling water system in steel works. Laboratory and field tests were performed for the indirect cooling water system of plate mill. Throughout the experiment, various factors such as leakage of pipes, heating rate and capacity, and the reaction between existing and substitute inhibitors were carefully monitored. The results showed that the harmful effect of high temperature could be minimized, and satisfactory corrosion/scale controls were effectively achieved using inhibitor, even at the increased temperature of $80^{\circ}C$. The batch and field tests in the gas scrubbing cooling water system of blast furnace and cooling water system of corex plant indicated that the new inhibitor was more effective for the prevention of corrosion and scale than the existing one.

Leakage Prevention of Mechanical Seal in a Feed Water Pumpof Power Plant with Oxygen Water Treatment (산소주입 수처리 발전소용 급수펌프 밀봉장치의 누설방지)

  • Shin, Jung-Gook;Moon, Seung-Jae;Yoo, Hoseon
    • Plant Journal
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    • v.7 no.1
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    • pp.56-63
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    • 2011
  • The identifying cause of leakage problems on mechanical seal in a feed water pump of power plant have been difficult because of technical limits of domestic mechanical seal manufacturer and the various conditions of power plants. This paper can get a conclusion through the consideration study and experiment test of mechanical seal characteristics of feed water pump depending on oxygen treatment as follows. The oxygen treatment increase dissolved oxygen and cause a corrosion on the mechanical seal stationary ring composed of antimony as well as leakage problems. For solving leakage problems of seal, to eliminate dissolved oxygen in the cooling water of seal with hydrazine injection can prevent leakage problems of mechanical seal in feed water pump.

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Water Cooling Pipe Structure for Heat-Dissipation of HEV Inverter System (HEV용 인버터의 방열을 위한 수냉식 배관구조)

  • Kim, Gyoung-Man;Woo, Byung-Guk;Lee, Yong-Hwa;Kang, Chan-Ho;Chun, Tae-Won;Cho, Kwan-Yuhl
    • The Transactions of the Korean Institute of Power Electronics
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    • v.15 no.1
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    • pp.27-34
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    • 2010
  • To dissipate the heat generated from the switching devices in the inverter system of HEV, the water cooling structure is proposed. The bolt type cooling structure has a problem such as water leakage for high pressure of water, therefore the proposed cooling structure applied pipe structure in the heat sink. The heat dissipation characteristics for various structures of water channel and distance between heat source and water channel was analyzed through the simulation. heat dissipation effect for two types of water cooling structures was investigated. Based on the simulation results, two types of water cooling system for 30kW inverter system of HEV were manufactured and the heat dissipation effect was verified.

The Analysis of Electrical Conduction and Corrosion Phenomena in HVDC Cooling System and the Optimized Design of the Heat Sink of the Semiconductor Devices (HVDC 냉각시스템의 전기전도현상 및 부식현상 기술 분석과 스위칭 소자의 방열판 최적 설계 검토)

  • Kim, Chan-Ki;Park, Chang-Hwan;Kim, Jang-Mok
    • The Transactions of the Korean Institute of Power Electronics
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    • v.22 no.6
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    • pp.484-495
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    • 2017
  • In HVDC thyristor valves, more than 95% of heat loss occurs in snubber resistors and valve reactors. In order to dissipate the heat from the valves and to suppress the electrolytic current, water with a high heat capacity and a low conductivity of less than 0.2 uS/cm must be used as a refrigerant of the heat sink. The cooling parts must also be arranged to reduce the electrolytic current, whereas the pipe that supplies water to the thyristor heat sink must have the same electric potential as the valve. Corrosion is mainly caused by electrochemical reactions and the influence of water quality and leakage current. This paper identifies the refrigerants involved in the ionization, electrical conductivity, and corrosion in HVDC thyristor valves. A method for preventing corrosion is then introduced. The design of the heat sink with an excellent heat radiation is also analyzed in detail.

Theoretical Analysis and Effect of Condenser In-leakage in the Secondary Systems of YGN-1, 2 (영광-1, 2호기 2차계통 복수기누설의 이론적 분석 및 영향평가)

  • Suk, Tae-Won;Lee, Yong-Woo;Kim, Hong-Tae;Park, Sang-Hoon
    • Nuclear Engineering and Technology
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    • v.23 no.3
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    • pp.299-305
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    • 1991
  • Corrosive environment may be generated within steam generators from condenser cooling water in-leakage. Theoretical analysis of the accumulation of chloride as a sea water impurity is being carried out for the condenser cooling water used at YGN-1,2 nuclear power stations. Calculations have shown that highly concentrated chloride solution would be produced within the steam generators in the case of sea water in-leakage. Maximum allowable design condenser leak rate(0.5 gpm) leads chloride concentration of 2.3 ppm at steam generetor and 0.6 ppm at hotwell with the maximum blowdown rate and condensate purification. Concentration factor at steam generator is dependent only on both blowdoum rate and condensate purification efficiency as follows, Concentration Factor(equation omitted)(B$\neq$O) Blowdown and condensate purification are evaluated as the only effective measures to remove impurities from the secondary systems.

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