• Title/Summary/Keyword: Slurry system

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축산분뇨 처리에 적용된 급속액상부숙기술(TAO system)의 운전특성과 운전조건 (Operation Condition and Characteristics for Treatment of Piggery Slurry using Thermophilic Aerobic Oxidation System)

  • 이명규;이원일
    • 한국축산시설환경학회지
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    • 제6권3호
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    • pp.161-168
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    • 2000
  • The study exploited TAO system for the treatment of piggery slurry and aimed to draw characteristics and conditions of the reactor by differentiating the number of air input pump and foam cutter. The results are: 1. Under different operation condition, Run-3 with three air input pumps and four foam cutters showed the highest efficiency in the change of water level and temperature; 40-70cm and 45-55$^{\circ}C$, respectively. 2. Evaporation volume in Run-3 was the highest; 55.5l/$m^2$ . day in Run-1, 75.0/$m^2$ . day in Run-2, and 120.3/$m^2$ . day in Run-3. 3. Throughout the experimental period, temperature inside the reactor was maintained at around 5$0^{\circ}C$, regardless of seasonal temperature changes.

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아이스슬러리형 빙축열 시스템을 이용한 냉각 시스템의 성능에 관한 실험적 연구 (Characteristic Analysis of the Cooling System Using Ice Slurry Type Heat Storage System)

  • 이동원;김정배
    • 에너지공학
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    • 제20권1호
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    • pp.30-35
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    • 2011
  • 2중관형과 판형 열교환기에 에틸렌 클리콜-물 수용액으로 만들어진 아이스슬러리를 적용하는 경우의 유동 및 열적 특성을 규명하기 위하여 실험을 수행하였다. 아이스슬러리의 질량유속과 얼음 분율은 각각 800에서 3500 kg/$m^2s$과 0에서 25%이었다. 실험을 통해, 압력강하와 열전달율은 질량유속과 얼음 분율에 따라 증가하였다. 그러나 얼음 분율의 효과는 높은 질량유속 영역에서는 크지 않은 것으로 나타났다. 낮은 질량유속에서는 압력강하와 열전달율의 급속한 증가가 질량 유속에 관계되는 것으로 나타났다.

준설시험루프를 이용한 모래-물 혼합물 배송에 관한 연구 (Study of Hydraulic Transport of Sand-water Mixture by a Dredging Test Loop)

  • 이만수;박영호;이영남;정충기
    • 한국지반공학회:학술대회논문집
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    • 한국지반공학회 2005년도 춘계 학술발표회 논문집
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    • pp.1504-1511
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    • 2005
  • The efficiency of the hydraulic transport of soil-water mixtures is an important factor in designing and operating a pump & pipeline system and is directly connected with dredging cost and working period. However, the hydraulic transport mechanism in the slurry flow inside the pipeline such as frictional losses, specific energy consumption, deposition velocity has not been well established. In this study a new dredging test loop system was designed and built. It is composed of a slurry pipeline with pipes of different diameters, a centrifugal slurry pump and a diesel engine connected with the slurry pump. and equipped with modern measuring facilities that enable to measure all important characteristics of a transportation system. The objective of this paper is to discuss the efficiency of the hydraulic transport of the Jumoonjin sand-water mixtures in the dredging test loop and to present simple equations induced from the test results of the loop that can express the transport product and the transport productivity.

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판형 열교환기를 이용한 과냉각수용액에서 유동과냉도 및 냉각속도가 연속제빙에 미치는 영향 (Influence of the Supercooling Degree and Cooling Rate on a Continuous Ice Formation by a Supercooled Aqueous Solution in Flow Using a Plate Heat Exchanger)

  • 이동규;백종현;홍희기;강채동
    • 설비공학논문집
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    • 제19권9호
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    • pp.647-653
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    • 2007
  • In dynamic ice storage system(DISS), ice slurry is formed not only from solution freezing by mechanical removing parts but also supercooled solution. However, in order to perform continuous ice formation in the system without mechanical moving parts, supercooled aqueous solution should be formed stable through cooling heat exchanger and be dissolved uniformly in storage tank. In previous study, the time of ice slurry increased as the pressure of the cooling heat exchanger(PHX) increased. In this study, a cooling experiment of an ethylene glycol 7mass% solution was performed with various inlet temperature of the PHX, which has constant brine inlet temperature of $-7^{\circ}C$. The temperature in the storage tank maintained to freezing point of the solution. At results, the time of ice slurry formation increased as the supercooling degree decreased and the cooling rate increased.

돈분뇨의 토양처리시 이온 성분의 용탈 특성 (Leaching of lonic Components from the Soil Applied with Swine Slurry)

  • 김태헌;류성필;김성수;오윤근;허철구
    • 한국환경과학회지
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    • 제12권3호
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    • pp.325-335
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    • 2003
  • An agricultural land application of swine slurry is one of the best management practices in Jeju island whose ground water must be protected. So as to study the effect of appling swine slurry on ground water or aquifer, incubation-leaching technique was used by assuming the incubating period of 1, 2, 4, 8, 16, or 32 days, and application rate of 3200.0 mgT-N/$\ell$ , 820.0 mgT-P/$\ell$, and 1887.0 mgK$\^$+/$\ell$ in swine slurry. The leachates were collected from the soil columns(PVC 30 cm L${\times}$5.5 cm D) packed 15cm in depth with Gangjeong soil series by washing with 100 mL distilled water. The leached components were measured by using ion chromatography far Cl$\^$-/, NO$_3$-N, F$\^$-/, Br$\^$-/, Na$\^$+/, K$\^$+/, Ca$^2$$\^$+/, and Mg$^2$$\^$+/ , atomic absorption spectrophotometry for Fe and Mn, and UV-Vis spectrophotometry for T-N and T-p. Application of swine slurry in naked soil could influence on the ground water or aquifer by increasing nitrate-nitrogen in leachate with time, or leaching the cations present in soils in accompany with anions because of H$\^$+/produced in nitrification. Therefore, careful consideration should be taken about what amount, when, where, and how fur protecting ground water system.

고압 저등급탄-이산화탄소 슬러리 분무특성에 관한 연구 (Spray Characteristics of a Coal Slurry with Liquid Carbon Dioxide)

  • 김창연;김학덕;송주헌
    • 한국수소및신에너지학회논문집
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    • 제26권4호
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    • pp.357-362
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    • 2015
  • There is potential method to utilize the liquid carbon dioxide ($LCO_2$) in coal gasification plants. The $LCO_2$ could be used to effectively transport coal particles instead of conventional carrier such as liquid water ($H_2O$) particularly in wet-fed gasifier. However, there is a lack of fundamental study on the atomization behavior of $LCO_2$ coal slurry under high pressure condition. In this study, the flashing spray characteristics of a coal mixture with $LCO_2$ was examined during a throttling process by using a flow visualization system. The spray of coal water slurry which is in the Rayleigh-type break up mode was significantly different. This difference indicates that the coal water slurry did not effectively transport the coal, as compared to $LCO_2$ coal slurry.

Rheology and pipeline transportation of dense fly ash-water slurry

  • Usui, Hiromoto;Li, Lei;Suzuki, Hiroshi
    • Korea-Australia Rheology Journal
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    • 제13권1호
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    • pp.47-54
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    • 2001
  • Prediction of the maximum packing volume fraction with non-spherical particles has been one of the important problems in powder technology. The sphericity of fly ash particles depending on the particle diameter was measured by means of a CCD image processing instrument. An algorithm to predict the maximum packing volume fraction with non-spherical particles is proposed. The maximum packing volume fraction is used to predict the slurry viscosity under well dispersed conditions. For this purpose, Simha's cell model is applied for concentrated slurry with wide particle size distribution. Also, Usui's model developed for aggregative slurries is applied to predict the non-Newtonian viscosity of dense fly ash - water slurry. It is certified that the maximum packing volume fraction for non-spherical particles can be successfully used to predict slurry viscosity. The pressure drop in a pipe flow is predicted by using the non-Newtonian viscosity of dense fly ash-water slurry obtained by the present model. The predicted relationship between pressure drop and flow rate results in a good agreement with the experimented data obtained for a test rig with 50 mm inner diameter tube. Base on the design procedure proposed in this study, a feasibility study of fly ash hydraulic transportation system from a coal-fired power station to a controlled deposit site is carried out to give a future prospect of inexpensive fly ash transportation technology.

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Particle Image Velocimetry 기법을 이용한 CMP 공정의 Slurry유동 분석 (Velocity Measurements of Slurry Flows in CMP Process by Particle Image Velocimetry)

  • 김문기;윤영빈;고영호;홍창기;신상희
    • 한국정밀공학회지
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    • 제23권5호
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    • pp.59-67
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    • 2006
  • Chemical Mechanical Polishing(CMP) in semiconductor production is characterized its output property by Removal Rate(RR) and Non-Uniformity(NU). Some previous works show that RR is determined by production of pressure and velocity and NU is also largely affected by velocity of flowfield during CMP. This study is about the direct measurement of velocity of slurry during CMP and whole flowfield upon the non-groove pad by Particle Image Velocimetry(PIV). Typical PIV system is modified adequately for inspecting CMP and slurry flowfield is measured by changing both pad rpm and carrier rpm. We performed measurement with giving some variation in the kinds of pad. The results show that the flowfield is majorly determined not by Carrier but by Pad in the case of non-groove pad.

슬러리 순환방식을 이용한 파이프 내면의 자기연마특성 (The Magnetic Finishing Characteristics of Pipe Inside Polished by Slurry Circulation System)

  • 박원규;최환
    • 한국기계가공학회지
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    • 제3권1호
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    • pp.38-44
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    • 2004
  • An internal finishing process by the application of magnetic abrasive machining has been developed as a new technology to obtain a fine inner surface of non-ferromagnetic pipe. In this paper, an abrasive slurry circulation system was designed and manufactured. As a result, it was found that a fine inner surface of pipe was available by the use of these machining methods. The basic machining characteristics of pin-type magnetic tools were analyzed experimentally. In addition, the experimental results show that pin-type magnetic tools have more machining efficiency than Iron particles as magnetic tools.

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STI-CMP용 세리아 슬러리 공급시스템에서 거대입자와 필터 크기가 Light Point Defects (LPDs)에 미치는 영향 (Effects of Large Particles and Filter Size in Central Chemical Supplying(CCS) System for STI-CMP on Light Point Defects (LPDs))

  • 이명윤;강현구;박진형;박재근;백운규
    • 반도체디스플레이기술학회지
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    • 제3권4호
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    • pp.45-49
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    • 2004
  • We examined large particles and filter size effects of Central Chemical Supplying (CCS) system for STI-CMP on Light Point Defects (LPDs) after polishing. As manufacturing process recently gets thinner below 0.1 um line width, it is very important to keep down post-CMP micro-scratch and LPDs in case of STI-CMP. Therefore, we must control the size distribution of large particles in a slurry. With optimization of final filter size, CCS system is one of the solutions for this issue. The oxide and nitride CMP tests were accomplished using nano-ceria slurries made by ourselves. The number of large particles in a slurry and the number of LPDs on the wafer surface after CMP were reduced with decrease of the final filter size. Oxide removal rates slightly changed according to the final filter size, showing the good performance of self-made nano ceria slurries.

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