• Title/Summary/Keyword: aspen

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Orimulsion 사용 분류층 가스화기의 성능 예측

  • 이승종;이진옥;김형택
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • 1994.05a
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    • pp.78-85
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    • 1994
  • ASPEN(Advanced System Process ENgineering) 코드를 이용하여 오리멀젼(orimulsion)을 이용한 가스화기의 성능을 예측하고, 발전 연료로서의 적합성 등을 살펴보았다. 오리멀젼은 역청(bitumen)에 물을 섞은 연료로 중유와 석탄의 중간 정도의 성질을 가지고 있다. 본 연구에서는 오리멀젼 가스화기의 운전 특성을 파악하고 주입되는 산화제 양을 변화시켜 산화제의 가스화기 운전온도에 미치는 영향과 생성되는 주요 합성가스 성분에 미치는 영향 등을 예측하고 새로운 연료로서의 타당성 여부를 검토하였다.

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electric Power System Laboratory, Institute for Advanced Engineering (3톤/일급 석탄가스화기에서의 가스화 특성)

  • 유영돈;임동렬;유희종;김원배;정석우;윤용승
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • 1996.04a
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    • pp.49-52
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    • 1996
  • 3톤/일 미분탄 처리 용량을 갖는 석탄 가스화기에 대한 운전 조건 및 특성을 조사하기 위하여 먼저 ASPEN 모사를 통하여 얻은 최적 가스화 조건을 3톤/일 석탄 가스화기 초기 운전 조건으로 결정하였다. 모사 결과에서 산소/석탄의 무게비가 가스화기 운전에 중요한 변수임을 알 수 있었다. 모사 결과를 기초로 운전한 결과 산소/석탄의 무게비가 0.7 근처에서 일산화탄소 및 수소의 생성율이 최대임을 알 수 있었고 생성 가스의 발열량은 2500kcal/N㎥ 정도임을 알 수 있었다.

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석탄가스화 복합발전 플랜트에서의 폐열회수보일러 설계에 따른 증기터빈 시스템 성능변화

  • 이진욱;김대규;조병화
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • 1993.11a
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    • pp.13-21
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    • 1993
  • 석탄가스화 복합발전 플랜트의 부속공정인 중기터빈 시스템에 대한 공정 전산해석을 상용 공정해석 소프트웨어인 ASPEN 코드를 이용하여 수행하였다. 폐열회수보일러에서 생성되는 고압증기 조건을 2400psig로 채택하였으며, 폐열회수보일러의 열교환기 배열 및 생성증기의 조건에 따른 증기터빈 시스템의 성능변화를 고찰하였다. 페열회수보일러에서의 열교환기 배열, 생성중기 조건 및 공급수 예열 방법에 따라 증기터빈 시스템의 성능이 변화하게 되므로 이의 정확한 이해를 통하여 증기터빈 시스템의 최적화를 도모할 수 있다.

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A Study on System Optimization of Texaco Gasifer Based IGCC(I) (텍사코 가스화기 적용 석탄가스화 복합발전소 계통 최적화 연구(I))

  • 조상기;김종진;서석빈;이윤경
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • 1999.05a
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    • pp.49-53
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    • 1999
  • 석탄가스화복합발전시스템 설계기술 개발 연구의 일환으로 상용 공정설계 프로그램인 Aspen Plus, Tsweet, Gatecycle을 이용하여 계통구성 최적화 연구를 수행하였다. 석탄은 대동탄(Tatung Coal)을 사용하였으며 그 성상은 <표 1>과 같다. 대동탄은 국내화력발전설비에서 사용되고 있는 모든 석탄을 대상으로 석탄의 특성에 따른 가스화 반응특성을 분석한 결과, 석탄가스화에 가장 적합한 성상으로 나타난 바 있다.(중략)

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A Study on the Thermal Designs of 300 MW-Class IGCC Plant (300 MW급 IGCC 플랜트의 열 설계 연구)

  • 이윤경;서석빈;김종진
    • Journal of Energy Engineering
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    • v.11 no.2
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    • pp.81-89
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    • 2002
  • IGCC (Integrated Coal Gasification Combined Cycle) is a technology that generates electric power using coal gasification and gasified fuel. Carbon conversion value of IGCC is higher and the influence on the environment is lower than the pulverized coal power plant. Especially, in the nations where the weight of fossil fuel for power generation is remarkably high like in Korea, IGCC stands out as an alternative plan to cope with sudden limitation for the emissions. In this paper, system design study for the commercial IGCC system which the introduction is imminent to Korea was performed. Two cases of entrained gasification process are adapted, one is FHR(full heat recovery) type IGCC system for high efficiency and the other is Quench type IGCC system for low cost. System simulations using common codes like AspenPlus were performed for each system. In the case of Quench system, system option study and sensitivity analysis of the air extraction rate was performed. Thermal performance result for the FHR system is 42.6% (HHV, Net) and for the quench system is 40% (HHV, net) when 75% air is extracted.

Redrying Fire - Retardant - Treated Structural Plywood (구조용(構造用) 내화처리(耐火處理) 합판(合板)의 재건조(再乾燥)에 관(關)한 연구(硏究))

  • Lee, Phil-Woo;Schaffer, E.L.
    • Journal of the Korean Wood Science and Technology
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    • v.9 no.4
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    • pp.1-21
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    • 1981
  • Exterior grades of Douglas-fir and aspen plywood were impregnated with interior fire-retardant chemicals and redried under low-, intermediate-, and high-temperature drying conditions. Fire-retardant treatments included borax-boric acid, chromated zinc chloride, minalith, pyresote, and a commercial formulation. Drying processes included kiln and press-drying. Evaluated were drying rates and defects generated. The borax-boric acid and the commercial treatments redried at rates similar to water-treated controls. Other salt treatments were significantly slower drying and more defect prone. Chromated zinc chloride treatment was consistently the slowest drying and most defect prone. Press drying was three times faster at an equivalent temperature level. However, thickness shrinkage doubled because of 50 1b/in. platen pressure.

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A Reliability of Equation of State for Nitrogen, Oxygen and Argon (질소, 산소, 아르곤에 대한 상태방정식의 신뢰도)

  • Yong Pyeong-Soon;Moon Hung-Man;Son Moo-Ryong;Yi Sung-Chul
    • Journal of the Korean Institute of Gas
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    • v.1 no.1
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    • pp.41-48
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    • 1997
  • The equation of state is widely utilized as a simple model for the prediction of gas properties. There are several equations of state and they often make diverse and hard to believe output of gas properties. In this study, We show a reliability of equation of state for nitrogen, oxygen and argon in pressure range from 1 bar to 30 bar and temperature range from liquefaction to room temperature. We use three equations of state such as Soave-Redlich-Kwong, Peng-Robinson and BWR-LS' equation of state which provided in the Aspen plus. The results were compared with literatures and virial equation. Finally, We report the differences of process calculation of distillation column and expansion turbine in cryogenic air separation plant with change of equation of state.

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Simulation of Separation and Purification Process of 50 kg/day Pilot Plant for DME Production (일일 50 kg DME 생산을 위한 파일럿 플랜트 분리 정제공정 모사)

  • Cho Jung-Ho;Cho Won-Il;Na Young-Jin;Shin Dong-Keun;Rhim Kye-Kyu
    • Journal of the Korean Institute of Gas
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    • v.10 no.2 s.31
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    • pp.22-26
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    • 2006
  • In this study, modeling and simulation works using Aspen Plus were carried out for DME separation and purification process of pilot plant for the daily production of 50 kg of DME. For modeling of the entire DME separation unit, NRTL liquid activity coefficient model was used for the prediction of liquid phase non-idealities, Henry's law option was also used for the estimation of solubilities of light gases in solvents and SRK equation of state model was utilized for the description of vapor phase non-idealities. DME having over 98 wt% purity was obtained as a side distillate product in a DME purification column.

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Simulation Study on Liquid Air Energy Storage (LAES) System using Dual Refrigeration Cycles and Thermal Oil Circulation (냉매사이클과 열매체유 순환을 활용한 액화공기에너지저장 시스템 공정모사 연구)

  • Jang, Soonnam;Park, Jongpo
    • Journal of the Korean Institute of Gas
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    • v.22 no.4
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    • pp.63-73
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    • 2018
  • Innovative technical process for Energy Storage System (ESS), Liquid Air Energy Storage system (LAES) is mature technologies based on the gas liquefaction process. In spite of many advantages such as high energy density, no geographical constraints, low investment costs and long useful life, the system has not yet widely commercialized due to low round trip efficiency. To improve RTE and acquire high yield of liquid air, various configurations of LAES process have been considered. In this research, dual refrigerants cycle (R-600a and methanol) for air liquefaction and thermal oil circulation for power generation via liquid air gasification have been applied to improve cycle performance significantly using Aspen HYSYS simulator.

A Study on the N2O Separation Process from Crude N2O (Crude N2O로부터 정제된 N2O 분리공정에 관한 연구)

  • Cho, Jungho;Lee, Taekhong;Park, Jongki
    • Korean Chemical Engineering Research
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    • v.43 no.4
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    • pp.467-473
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    • 2005
  • Liquid phase nitrous oxide ($N_2O$) contains air, carbon monoxide, water, carbon dioxide and NOx as main impurities. It is known to be very dangerous to obtain a very pure $N_2O$ product by using solidification at low temperature. In this study a new method to obtain a high purity of $N_2O$ product based on a continuous distillation process was introduced. For the modeling of the continuous distillation process to obtain a product having a purity over 99.999% of $N_2O$ stream, Intalox wire gauze packing- No. SCH-80S gauze packing column was used. Peng-Robinson equation of state was used for the modeling of the continuous distillation process and refrigeration system. Computational results performed in this work showed a good agreement with Aspen Plus simulation results.