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정년호 ( Nyeon Ho Jeong ),민병연 ( Byung Yeon Min ),박현주 ( Hyun Joo Park ) 한국부식방식학회(구 한국부식학회) 2010 Corrosion Science and Technology Vol.9 No.5
Most of the thirteen substations in operation in the metropolitan area were installed around the year 2000, and since water cooling methods are used to directly withdraw heat from transformer oils, a stable supply of electric power is required through optimal maintenance of facilities. The water cooling tower installed outdoors, which uses the water supply as sprinkler water, experiences the most problems. Since more than 90% of the cooling water is reused, the dissolved composition in the water becomes concentrated due to long operating hours, and impurities dissolve in the water due to air flowing in from the outside, forming hard scales on the outer surface of the cooling tube, and in extreme cases, reacting with the tube material composition, leading to corrosion. As a result, not only is cooling efficiency lowered, but in extreme cases the cooling tube must be replaced. In this study, the characteristics and composition of the scales formed on the cooling tube were analyzed and corrosion characteristics of material types were identified in order to find an efficient maintenance method for cooling rubes. In addition, the degree of dissolution of various chemicals were investigated during the removal of scales that have been formed.
한상철,정년호,한영희,성태현,Han, Sang-Chul,Jeong, Neyon-Ho,Han, Young-Hee,Sung, Tae-Hyun 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.6
Large and single-grain Y-Ba-Cu-O(YBCO) bulk superconductors have been fabricated by using a seeded infiltration and growth method. $Y_2BaCuO_5$(Y211) precursor pellets and $YBa_2Cu_3O_x$(Y123) liquid source pellets were prepared using commercial powder and were processed by infiltration and growth method to achieve low pore and high trapped field property. The superconductor properties of the single crystal are measured and analyzed in relation with the density and size of the Y211 particle in the Y123 matrix. An optimum processing condition is suggested based on the analyzed results.
김경숙,이승민,정년호,양석란 한국화학공학회 2000 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.38 No.6
57만 ㎾급 유연탄 발전소의 배연 탈황설비의 GGH(gas gas heater)스케일의 생성원인을 규명하여 원활한 탈황설비의 운전을 도모하고자 성능시험중인 두 발전소(T와 H로 명명)의 GGH에서 채취한 스케일에 대한 성분분석, 형상 및 결정구조분석을 실시하였다. 우선 저배율 입체 현미경에 의한 외형관찰 결과를 보면, 흡수탑 스케일은 판위에 스케일이 쌓여있는 형상을 보이고 손으로 쉽게 부서지는 반면에 GGH스케일은 직육면체의 덩어리 모양으로 아주 단단하여 강도가 강한 것으로 관찰되었다. 또한 EDX 띤 성분분석결과, Si, Al 및 Ca을 많이 포함하고 있으며, XRD에서 mullite와 quartz 결정구조가 관찰되고, SEM에서 크기가 1㎛ 이하로 아주 미세하고 석탄회의 전형적인 구형 모양이 관찰된 것으로 볼 때, 이는 흡수탑을 거치지 않은 미처리된 배가스에서 나온 석탄회일 것으로 추정된다. 그 이외에 SEM과 XRD예서 관찰되는 석고의 크기는 수 ㎛에서 10㎛사이로 일반적인 탈황설비에서 생성되는 석고의 크기인 40㎛에 비해 상당히 작았다. 두 발전소의 스케일의 특성에는 약간의 차이가 있지만 GGH 스케일의 생성원인은 배연 탈황설비 반응기에서 과포화 석고 슬러리가 비산되어 수 ㎛의 액적들이 M/E(mist eliminator)에서 제거되지 않고 GGH설비에 유입되어 습분은 제거되고 포화되어 스케일이 발생하고 여기에 보일러에서 유입되는 미처리된 배가스 중의 석탄회가 엉겨 붙게 되고 습분이 제거되면서 스케일화를 촉진한 것으로 판단된다. During the commission period of flue gas desulfurization(FGD), a considerable amount of scale was formed in GGH at 2 bituminous coal power plants which were named as T and H. Various attempts have been studied to identify the causes of the scale formed in GGH, for example, concentration analysis, surface morphology, and crystal structure of scale, gypsum and ash. According to the results of stereozoom microscopy, GGH scale was severely harder than absorber scale. In addition, Si, A1 and Ca were observed from concentration analysis, and quartz and mullite crystal structure were identified from XRD, and very fine(size: less than 1 ㎛) and spherical-shaped particles were shown from SEM. In addition, the size of gypsum particle observed from XRD and SEM was 1-10 ㎛, and this size was very minute compared to the typical size of gypsum(size: about 40 ㎛) particle produced in FGD process. Although small differences were found between 2 power plants, the causes of scale formed in GGH were deduced that some saturated gypsum shiny was scattered in the reactor of FGD and that the slurry droplets were not eliminated properly in M/E. And then they arrived in GGH water or mist in them was eliminated, and finally formed the scale in GGH. The scale in turn got entangled with coal ash of untreated flue gas from boiler, and so the formation of scale was accelerated.
Y211 및 BaCO$_3$ 분말로 Screen Printing 법을 이용한 Cu-sheath의 YBCO 후막 제조
김경진,한상철,한영희,박병삼,정년호,윤희중,오제명,최희락,성태현 한국초전도학회 2004 Progress in superconductivity Vol.5 No.2
We fabricated YBCO thick films by using a screen printing method with $Y_2$BaCuO$_{5}$(Y211) and BaCO$_3$ powders on Cu-substrate in $N_2$ atmosphere. Cu-sheathed YBCO thick film process is more simple and economic than YBCO coated conductor methods. The heat treatment is performed in the range of 860 - 875 $^{\circ}C$ for 5 min in the tube furnace of $N_2$ atmosphere. The flow rate of $N_2$ gas is fixed 60 $m\ell$/min. Microstructure and phases of thick films were investigated by optical microscope, X-ray diffraction(XRD) and SEM. At heat-treatment temperature, the thick films were partially melted by liquid reaction between CuO of oxidized copper substrate and the powders screen-printed on Cu-sheath. During the heat-treatment procedure, YBCO superconducting grains nucleate.e.
박병준,정세용,이정필,박병철,정년호,성태현,한영희,Park, B.J.,Jung, S.Y.,Lee, J.P.,Park, B.C.,Jeong, N.H.,Sung, T.H.,Han, Y.H. 한국초전도학회 2008 Progress in superconductivity Vol.10 No.1
A Superconductor Flywheel Energy Storage System(SFES) mainly consists of a pair of non-contacting High Temperature Superconductor(HTS) bearings that provide very low frictional losses, a composite flywheel with high energy storage density. The HTS bearings, which offer dynamic stability without active control, are the key technology that distinguishes the SFES from other flywheel energy storage devices, and great effort is being put into developing this technology. The Superconductor Journal Bearing(SJB) mainly consists of HTS bulks and a stator, which holds the HTS bulks and also acts as a cold head. Static properties of HTS bearings provide data to solve problems which may occur easily in a running system. Since stiffness to counter vibration is the main parameter in designing an HTS bearing system, we investigate SJB magnetic force through static properties between the Permanent Magnet(PM) and HTS. We measure stiffness in static condition and the results are used to determine the optimal number of HTS bulks for a 100kWh SFES.
윤희중,한영희,한상철,정년호,김경진,박병삼,오제명,성태현 한국초전도학회 2004 Progress in superconductivity Vol.5 No.2
For designing a flywheel system using superconductor, it is necessary to understand the basic characteristics of the classical superconductor bearing. It is difficult to expect the characteristics of superconductor bearings using models that have been introduced up to now. In the "Frozen image" concept, the farce between the permanent magnet and the superconductor can be divided into two forces between permanent magnet and two imaginary magnets in the superconductor; one represents attraction farce and the other represents a repulsion force. We calculated the characteristics of two superconductor bearings, such as an axial, the radial stiffness and the levitation force. This calculation method was very helpful to expect the characteristics of the superconductor bearings. Using this model, we established the optimum condition for the superconductor bearing.r bearing.