• Title/Summary/Keyword: 고체분리속도

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Development of Solid Separator for Selective Solid Circulation in Two-interconnected Fluidized Beds System (2탑 유동층 시스템에서 선택적 고체순환을 위한 고체분리기 개발)

  • Ryu, Ho-Jung;Park, Young Cheol;Lee, Seung-Yong;Kim, Hong-Ki
    • Korean Chemical Engineering Research
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    • v.47 no.2
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    • pp.195-202
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    • 2009
  • As a basic research of developing two-interconnected fluidized beds system for selective solid circulation, a solid separator was developed to separate fine and coarse particles by means of particle size difference with particle size separation system equipped with metal screen. The effects of gas velocity, height of solid separator, and separation area on the solid separation rate were investigated as well. The solid separation rate increased as the gas velocity, height of solid separator, and separation area increased. As the gas velocity and height of the solid separator increased, the variation of the solid separation rate was consistent with that of bubble size. Consequently, coarse($212{\sim}300{\mu}m$) and fine($63{\sim}106{\mu}m$) particles were separated using the solid separator and the solid separation rate was ranged from 4.4 to 127 g/min. We also proposed two interconnenced fluidized beds system for sorption enhanced water-gas shift process equipped with the developed solid separator.

A Study on Two-interconnected Fluidized Beds System for Selective Solid Circulation (선택적 고체순환을 위한 2탑 유동층 시스템 연구)

  • Ryu, Ho-Jung;Jang, Myoung-Su;Kim, Hong-Ki;Lee, Dong-Kyu
    • Korean Chemical Engineering Research
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    • v.47 no.3
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    • pp.337-343
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    • 2009
  • To apply to novel two-interconnected fluidized beds system for selective solid circulation, a solid separator and a solid circulation system were developed. The solid separation rate increased as the gas velocity through the solid injection nozzle, solid height, and diameter of solid injection nozzle increased. However, the effect of the fluidization velocity was negligible. Coarse($212{\sim}300{\mu}m$) and fine($63{\sim}106{\mu}m$) particles were separated using the solid separator and the solid separation rate was ranged from 66 to 453 g/min. The solid circulation rate increased as the gas velocity through the solid injection nozzle, solid height, and the number of solid intake holes increased. However, the effect of the fluidization velocity was negligible. Fine particle was circulated using the solid circulation system and the solid circulation rate was ranged from 65 to 390 g/min. We also proposed two interconnenced fluidized beds system for selective solid circulation equipped with the developed solid separator and the solid circulation system. Long-term operation of continuous solid circulation up to 20 hours has been performed to check feasibility of stable operation. The pressure drop profiles in two beds and the solid separation rate were maintained steadily, and therefore, we could conclude that solid circulation was smooth and stable.

Effects of Operating Variables on Solid Separation Rate in Two-interconnected Fluidized Beds System for Selective Solid Circulation (선택적 고체순환을 위한 2탑 유동층 시스템에서 고체분리속도에 미치는 조업변수들의 영향)

  • Ryu, Ho-Jung;Jin, Gyoung-Tae;Bae, Dal-Hee;Kim, Hong-Ki
    • Korean Chemical Engineering Research
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    • v.47 no.3
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    • pp.355-361
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    • 2009
  • Effects of operating variables on solid separation rate in two-interconnected fluidized beds system for selective solid circulation have been investigated. Coarse(212~300 or $425{\sim}600{\mu}m$) and fine($63{\sim}106{\mu}m$) particles were separated using the solid separator and the solid separation rate was ranged from 66 to 987 g/min. The solid separation rate increased as the gas velocity through the solid injection nozzle, solid height, diameter of solid injection nozzle, particle size of coarse particles, aperture of the solid separator, and weight fraction of fines in the solid mixture increased. However, the effect of the fluidization velocity was negligible.

Effects of Operating Variables on Separation Rate and Separation Efficiency in Ash Separator for Solid Fuel Chemical Looping Combustor (고체연료 매체순환연소기를 위한 회재분리기에서 분리속도 및 분리효율에 미치는 조업변수들의 영향)

  • RYU, HOJUNG;LEE, DONGHO;YOON, JOOYOUNG;JANG, MYOUNGSOO;BAE, DALHEE;PARK, JAEHYEON;BAEK, JEOMIN
    • Transactions of the Korean hydrogen and new energy society
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    • v.27 no.2
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    • pp.211-219
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    • 2016
  • To develop an ash separator for the solid fuel chemical looping combustion system, effects of operating variables such as solid injection nozzle velocity, diameter of solid injection nozzle, gap between solid injection line and vent line, vent line inside diameter, and solid intake height on solid separation rate and solid separation efficiency were measured and discussed using heavy and coarse particle and light and fine particles mixture as bed material in an acrylic fluidized bed apparatus. The solid separation rate increased as the solid injection nozzle velocity and the diameter of solid injection nozzle increased. However, the solid separation rate decreased as the gap between solid injection line and vent line, the vent line inside diameter, and the solid intake height increased. The solid separation efficiency was in inverse proportion to the solid separation rate. In this study, we could get high solid separation rate up to 2.39 kg/hr with 91.6% of solid separation efficiency.

CFD Validation of Solid-Liquid Two-Phase flow for Analysis of Drilling Fluid Flow Characteristics (이수의 유동 특성 분석을 위한 고체-액체 2상 유동의 전산유체역학적 유효성 검토)

  • Choi, Yong-Seok;Park, Jae-Hyoun;Bae, Jae-Hwan;Lee, Bong-Hee;Kim, Jeong-Hwan
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.24 no.5
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    • pp.611-618
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    • 2018
  • In this study, numerical analysis of solid-liquid two-phase flow was conducted as a preliminary step to analyze the flow characteristics of drilling fluid using the commercial CFD code, ANSYS CFX 14.5. The homogeneous model and separated flow model were used to simulate solid-liquid two-phase flow phenomena. In the separated flow model, Gidaspow's drag force model was applied with the kinetic theory model was applied for solid particles. The validity of the numerical model used in this study was verified based on the published experimental results. Numerical analysis was carried out for volume fractions of 0.1 to 0.5 and velocities of 1 to 5 m/s in a horizontal tube with a diameter of 54.9 mm and a length of 3 m. The Pressure drop and volume fraction distribution of solid particles were confirmed. The pressure drop was predicted using the homogeneous model and separated flow model within the MAE of 17.04 % and 8.98 %, respectively. A high volume fraction was observed in the lower part of the tube, and the volume fraction decreased toward the upper part. As velocity increased, variations in volume fraction distribution at varying heights were decreased, and the numerical results predicted these flow characteristics well.

Conceptual Design and Hydrodynamic Properties of a Moving Bed Reactor for Intrinsic $CO_2$ Separation Hydrogen Production Process ($CO_2$ 원천분리 수소 제조 공정을 위한 이동층 반응기의 개념 설계 및 수력학적 특성)

  • Park, Dong-Kyoo;Cho, Won-Chul;Seo, Myung-Won;Go, Kang-Seok;Kim, Sang-Done;Kang, Kyoung-Soo;Park, Chu-Sik
    • Clean Technology
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    • v.17 no.1
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    • pp.69-77
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    • 2011
  • The intrinsic $CO_2$ separation and hydrogen production system is a novel concept using oxidation and reduction reactions of oxygen carrier for both $CO_2$ capture and high purity hydrogen production. The process consists of a fuel reactor (FR), a steam reactor (SR) and an air reactor (AR). The natural gas ($CH_4$) is oxidized to $CO_2$ and steam by the oxygen carrier in FR, whereas the steam is reduced to hydrogen by oxidation of the reduced oxygen carrier in SR. The oxygen carrier is fully oxidized by air in AR. In the present study, the chemical looping moving bed reactor having 200 L/h hydrogen production capacity is designed and the hydrodynamic properties were determined. Compared with other reactors, two moving bed reactors (FR, SR) were used to obtain high conversion and selectivity of the oxygen carrier. The desirable solid circulation rates are calculated to be in the range of $20{\sim}100kg/m^2s$ from the conceptual design. The solid circulation rate can be controlled by aeration in a loop-seal. To maintain the gas velocity in the moving beds (FR, SR) at the minimum fluidization velocity is found to be suitable for the stable operation. The solid holdup in moving beds decrease with increasing gas velocity and solid circulation rate.

Design, Manufacture and Test of Subscale Solid Rocket Motor with Pulse Separation Device (펄스분리장치를 적용한 소형 추진기관의 설계, 제작 및 시험평가)

  • Ryu, Jung-Hun;Lee, Won-Bok;Suh, Hyuk;Kim, Won-Hoon;Oh, Jong-Yun
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2010.05a
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    • pp.133-137
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    • 2010
  • A dual pulse solid rocket motor has several advantages compared to the single one. The range and the terminal velocity of the guided missile can be remarkably increased by the application of the pulse separation device(PSD) to the solid rocket motor which resulted in appropriate thrust distribution. In this study, the subscale dual pulse solid rocket motor with the bulkhead type PSD was designed, manufactured, and fire-tested. The bursting pressure, thermal characteristics, and the structural safety of the PSD were obtained by the tests and the results will be applied to the design of full-scale dual pulse rocket motor.

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Study on Pulse Separation Device of Bulkhead Type for Solid Rocket Motors (고체 추진기관의 격벽형 펄스분리장치 연구)

  • Cho, Won-Man;Kim, Won-Hoon;Chang, Hong-Been;Oh, Jong-Yun;Lee, Bang-Eop;Lee, Jong-Won
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2009.05a
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    • pp.187-190
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    • 2009
  • A multiple pulse rocket motor distributes the thrust energy more effectively compared to typical rocket motor as providing subsequent thrusts by the pulse motors of the missile. The pulse rocket motor is the advanced technology to improve an end game capability of the missile by increasing the range and final velocity. A pulse separation device is the core part of the pulse motor. The pulse separation device of bulkhead type was designed and developed. The elastic-plastic structural analysis of the bulkhead and rupture disc was conducted. Several air tests were also conducted to confirm the structural safety and acceptability about the design concept. Test results were compared with the analysis results, which showed reasonable agreements.

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Bursting Performance Analysis of a Pulse Separation Device for a Rocket Motor (추진기관 적용 펄스분리장치의 파열특성 분석)

  • Lee, Dong-Won;Lee, Won-Bok;Kim, In-Sik;Kim, Won-Hoon
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2011.04a
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    • pp.245-248
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    • 2011
  • A multi pulse rocket motor(MPRM) has several advantages compared to the single one. The range and the terminal velocity of the guided missile can be remarkably increased by the application of the pulse separation device(PSD) to the solid rocket motor which resulted in appropriate thrust distribution. In this study, the full scale heavy type dual pulse rocket motor with the bulkhead type PSD was designed, manufactured, and fire-tested. The bursting time and pressure of PSD were analyzed by the pressure, thrust and vibration results of static fire tests. As a result, the design requirement was verified that bursting pressure is lower than 30% of 2nd pulse operating pressure.

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Isolation and Characterization of Rhizobia from Soybean Cultivated in Korea (대두(大豆) 근류균(根瘤菌)의 분리(分離) 및 특성(特性))

  • Yun, Han-Dae;Cho, Moo-Je;Lee, Ke-Ho
    • Applied Biological Chemistry
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    • v.30 no.2
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    • pp.153-162
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    • 1987
  • Soybean rhizobia were isolated from 101 soybean (Glycine max.) cultivar which had been grown for the breeding experiment in Korea. Seven strains of the fast-growing soybean rhizobia and nine strains of the slow-growing soybean rhizobia were selected on the basis of their growth rate in AMA medium and their high ability of nodulation. The slow-growing soybean rhizobia were identified as Bradyrhizobium japonicum in the acetylene-reducing activity, microbial characteristics, and biochemical characteristics whereas the fast-growing soybean rhizobia were very similar to Rhizobium fredii.

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