• Title/Summary/Keyword: chemical pump

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Chemiluminescence System with Air Pump as a Sensor for Determination of Metal Levels in Rain

  • Hong, Hyuck-Gi;Lim, H.B.
    • Bulletin of the Korean Chemical Society
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    • v.26 no.12
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    • pp.1937-1940
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    • 2005
  • A lab-made chemiluminescence system with air pump was developed for monitoring of some metal levels in rain. The air pump enabled injection of 17.7 $\mu$g samples into a glass cell filled with luminol-$H_2O_2$ reagent of typically 300 $\mu$L for chemiluminescence measurement. The monitored trend of total metal ions in the rain collected in our campus was compared with analytical results of each metal ion from GFAAS. The system was also demonstrated to determine $Cr^{6+}$ by reduction to $Cr^{3+}$ using $SnCl_2$. The limit of detection for $Cr^{6+}$ obtained by 4 measurements was 85.0 pg $mL^{-1}$ with a relative standard deviation of 3.4%. Although this system doesn’t have selectivity due to the characteristics of chemiluminescence, application of it to environmental monitoring as a sensor for some transition metal ions was demonstrated.

A Study on the Correct injection method for low dissolution liquid in the Water Treatment Plant (상수도의 저용해성 액체 정량투입 방안 연구)

  • Kim, Jin-Hoon;Park, Jong-Ho
    • 유체기계공업학회:학술대회논문집
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    • 2005.12a
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    • pp.273-277
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    • 2005
  • The large particles of suspended matter in raw water can be removed by allowing them to settle out in a presedimentation basin. But there are smaller particles in almost all surface water and some groundwater that will not settle out within a reasonable time without some help to accelerate the process, In the coagulation and flocculation processes, nonsettleable solids are converted into large and heavier settleable solids by physical-chemical changes broght about by adding and mixing coagulant chemicals into the raw water. The object of this research was to improve corrective injection method for low dissolution liquid in the water treatment plant. A sort of chemical feed equipment are diaphram pump, flow control in combined magnetic flowmeter md control valve, roto dipper wheel system and tube pump. Particularly low dissolution liquid (Calcium Hydroxide) put in a bit by feed equipment, tube pump is very useful method for corrective injection method in the water treatment plant.

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A Study on the Reactor Design of Solid-Solid-Gas Chemical Heat Pump System (고체-고체-기체 화학 열펌프 시스템의 반응기 설계에 관한 연구)

  • Kim, S.J.;Lee, T.H.;Neveu, P.;Choi, H.K.;Lee, J.H.
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.6 no.4
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    • pp.406-416
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    • 1994
  • In this study the reactor design procedure and method of solid-solid-gas chemical heat pump system using STELF technology were investigated. For manufacturing IMPEX block which is the kernel of reactor, proper salt pair should be selected, and equilibrium temperature drop and COP should be examined for selected salt pair. Moreover, apparent density, residual porosity, and graphite ratio should be calculated to give minimum block volume and mass, and maximum energy density without causing heat and mass transfer problems. Since heat exchange area can be changed with operating condition, reactor diameter, length, and stainless steel thickness should be decided for desired specifications. These procedure and method were applied to the case study of 6kW cold production and 8 hours storage capacity reactor.

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Failure Analysis of Circulating Water Pump Shaft in Power Plant (발전 계획에서 순환 물 펌프 고장 분석)

  • Lee, Jaehong;Jung, Nam-gun
    • KEPCO Journal on Electric Power and Energy
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    • v.7 no.1
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    • pp.125-128
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    • 2021
  • This paper presents the root cause failure analysis of the circulating water pump in the 560 MW thermal power plant. A fractured austenitic stainless-steel shaft operated for 24 years was examined. Fracture morphology was investigated by micro and macro-fractographic analysis. The metallurgical analyses including chemical analysis, metallography and hardness testing were performed. The analysis reveals that the pump shaft was fractured due to the reverse bending load with combination of rotating bending load. Corrective actions for plant operator was recommended based on the analysis.

Development of Chemical Decontamination Process of Stainless Steel for Reactor Coolant Pump (원자로 냉각재 펌프용 스테인리스강에 대한 화학적 제염 공정 개발)

  • Kim, Seong-Jong;Han, Min-Su;Kim, Jeong-Il;Kim, Ki-Joon
    • Journal of Surface Science and Engineering
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    • v.40 no.5
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    • pp.234-240
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    • 2007
  • As a reactor coolant pump (RCP) is operated in the nuclear power system for a long time, so its surface is continuously contaminated by radioactive scales. In order to maintain for RCP internals, a special chemical decontamination process should be used to reduce the radiation from the RCP surface. In this study, applicable possibility in chemical decontamination for RCP was investigated for the various stainless steels. The stainless steel (STS) 304 showed the best electrochemical properties for corrosion resistance and the lowest weight loss ratio in chemical decontamination process model 3-1 than other materials. However, the pitting corrosion was generated in both STS 415 and STS 431 with the increasing numbers of cycle. The intergranular corrosion in STS 415 was sporadically observed. The sizes of their pitting corrosion were also increased with increasing cycle numbers.

Evaluation on Safety of Stainless Steels in Chemical Decontamination Process with Immersion Type of Reactor Coolant Pump for Nuclear Reactor (침적식 화학적 제염 공정 시 원자로 냉각재 펌프용 스테인리스강의 안전성 평가)

  • Kim, Seong-Jong;Han, Min-Su;Kim, Ki-Joon;Jang, Seok-Ki
    • Corrosion Science and Technology
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    • v.10 no.5
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    • pp.167-174
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    • 2011
  • Due to commercialization of nuclear power, most countries have taken interest in decontamination process of nuclear power plant and tried to develop a optimum process. Because open literature of the decontamination process are rare, it is hard to obtain skills on decontamination of foreign country and it is necessarily to develop proper chemical decontamination process system in Korea. In this study, applicable possibility in chemical decontamination for reactor coolant pump (RCP) was investigated for the various stainless steels. The stainless steel (STS) 304 showed the best electrochemical properties for corrosion resistance and the lowest weight loss ratio in chemical decontamination process with immersion type than other materials. However, the pitting corrosion was generated in both STS 415 and STS 431 with the increasing numbers of cycle. The intergranular corrosion in STS 431 was sporadically observed. The sizes of their pitting corrosion also increased with increasing cycle numbers.

Effect of The Impeller Discharge Angle on the Performance of a Spurt Vacuum Pump

  • Lee, Ji-Gu;Kim, Youn-Jea
    • Applied Science and Convergence Technology
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    • v.26 no.1
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    • pp.1-5
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    • 2017
  • The spurt vacuum pump is widely used to transfer sludge and slurry, and to control flow rate in a variety of processing fields, such as the oil, chemical, and fiber industries. The efficiency of the pump depends on the design parameters of the impeller, such as the number of blades, and the blade angle. In this study, the effect of the configuration of the impeller discharge angle of a spurt vacuum pump, which influences total head, shaft power, and efficiency, was numerically investigated using the commercial code, ANSYS CFX ver. 16.1. In addition, the performance of the pump was evaluated on the basis of the correlations between the total head, pump efficiency, and pressure distribution.

A Study on a Resorption Beat Pump Using Methanol-Glycerine (메탄올-글리세린을 이용한 재흡수 열펌프의 열역학적 모사 연구)

  • Min, Byong-Hun
    • Journal of Energy Engineering
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    • v.15 no.4 s.48
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    • pp.284-290
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    • 2006
  • The improvement of energy recovery is mandatory to decrease consumption of fossil fuels and to minimize negative impacts on the environment which originates from large cooling and heating demand. The absorption heat pump technology has a large potential for energy saving in this respect. Absorption heat pump is a means to upgrade waste heat without addition of extra thermal energy. In this study, resorption heat pump for energy recovery has been investigated using methanol-glycerine. The simulated calculation of theoretical thermal efficiency was performed based on the thermodynamic properties of the working fluid over various operating conditions. The thermal efficiency of higher than 0.4 was obtained by raising industrial waste heat, $70{\sim}80^{\circ}C$, by $40^{\circ}C$ in this system.