• 제목/요약/키워드: Gravity Drainage

검색결과 46건 처리시간 0.021초

모형실험에 의한 지오텍스타일의 중력배수 특성 연구 (Study on the Characteristics of Gravity Drainage for Geotextiles by Model Tests)

  • 이상호;권무남
    • 한국농공학회지
    • /
    • 제38권4호
    • /
    • pp.125-136
    • /
    • 1996
  • In order to investigate the characteristics of gravity drainage for geotextile, small-scale model tests for the geotextile chimney drain of earth dam which is a typical type of gravity drainage were carried out using 15 kinds of nonwoven and composite geotextiles. According to the results of this study, the drainage discharge of geotexgile drain generally increases with exponential function as hydraulic head increases and the increasing rate is greater in the coarser soil of dam material. It has a trend to increase when the construction slope of geotextile drain is steeper and the number of layers of geotextile is more. The relationship between the transmissivity of geotextile and the drainage discharge has positive correlation and the rate of increase is greater in the coarser soil. The geotextile products must be carefully selected in consideration of transmissivity of geotextile when the soil to be drained is coarser and the seepage flow is relatively high. Most of staple fiber nonwoven geotextile used in this study are found to be appropriate for drainage purpose. Among them, the composite geotextile the type of which geotextile is evaluated to be the most excellent material. But the geotextile of low permeability such as filament thermal bonded and filament spunbonded nowovens closely examined their transmissivity especially to be used for drainage function.

  • PDF

지붕 우수 배수 방식의 비교 (Roof Drainage System Comparison)

  • 유호준;이형창
    • 대한설비공학회:학술대회논문집
    • /
    • 대한설비공학회 2008년도 하계학술발표대회 논문집
    • /
    • pp.449-452
    • /
    • 2008
  • Originally developed in Scandinavia over 40 years ago, syphonic roof drainage systems have been in use in the UK since the early 1990's. Since then, many large projects have used the syphonic system to overcome installation problems which would have been difficult to solve using a traditional gravity rainwater system.

  • PDF

SAGD 법을 이용한 오일샌드 플랜트 열교환기망 최적화를 위한 사례연구 (Case Studies for Optimizing Heat Exchanger Networks in Steam-assisted Gravity Drainage Oil Sands Plant)

  • 조은비;정문;강춘형
    • 한국유체기계학회 논문집
    • /
    • 제19권3호
    • /
    • pp.19-24
    • /
    • 2016
  • Oil sands are a mixture of sand, clay, and a high-viscosity petroleum called bitumen. Steam-Assisted Gravity Drainage (SAGD) is the most viable and environmentally safe recovery technology for extracting bitumen. It extracts the viscosity-lowered bitumen by high pressure, high temperature steam injected into the bitumen reservoir. The steam is produced at the Central Processing Facility (CPF). Typically, more than 90% of the energy consumed in producing bitumen are used to generate the steam. Fuels are employed in the process, which cause economic and environmental problems. This paper explores the retrofit of heat exchanger network to reduce the usage of hot and cold utilities. The hot and cold utilities are reduced respectively 6% and 37.3% which in turn resulted in 5.3% saving of total annual cost by improving the existing heat exchanger network of the CPF.

수평배수재가 설치된 준설매립 점토의 압밀 거동 해석 (Analysis of Consolidation Behavior for Dredged Clay with Horizontal Drains)

  • 김수삼;장연수;박정순;오세웅
    • 한국지반공학회:학술대회논문집
    • /
    • 한국지반공학회 2000년도 가을 학술발표회 논문집
    • /
    • pp.641-648
    • /
    • 2000
  • The horizontal drain method by installing drains horizontally in the ground is often used to expedite the dispersion of pore water and to increase the strength of dredged soft clay under the action of gravity or vacuum. In this study a numerical analysis method is developed to predict the consolidation process of soft ground with horizontal drains. One-dimensional self-weight consolidation theory is extended tn three-dimensions] theory with appropriate boundary conditions of horizontal drains. In the condition of pore water drainage by gravity, the behavior of the dredged clay with horizontal drains is compared with that of the clay without drains. The influence of design factors of drains on consolidation process is also analyzed.

  • PDF

Optimization of Heat Exchanger Network in the Steam Assisted Gravity Drainage Process Integration

  • Rho, Seon-Gyun;Yuhang, Zhang;Hwang, InJu;Kang, Choon-Hyoung
    • International Journal of Advanced Culture Technology
    • /
    • 제8권2호
    • /
    • pp.260-269
    • /
    • 2020
  • The Steam Assisted Gravity Drainage (SAGD) process is an enhanced method to extract oil from bitumen which involves surface and central process facilities. This paper describes the Central Process Facilities (CPF) of SAGD and proposes several retrofit plans to the Heat Exchanger Network (HEN). In this approach, the process integration scheme is applied to estimate the energy saving in HENs, and various cases are modeled in favor of a commercial simulator. Throughout this work, a minimum approach temperature of 10℃ is assumed. The results reveal that, due to the HEN optimization using process integration, the heating and cooling duties can be reduced to 29.68MW and 1.886MW, respectively. Compared with the Husky case, all cases considered in this study indicate a potential reduction of at least 6% in total cost, including investment and operation costs.

HYSTERETIC MODELING ON THE CONVECTIVE TRANSPORT OF ORGANIC SOLVENT IN AN UNSATURATED SOIL ZONE

  • Lee, Kun-Sang
    • Environmental Engineering Research
    • /
    • 제11권5호
    • /
    • pp.241-249
    • /
    • 2006
  • A mathematical model is described for the prediction of convective upward transport of an organic solvent driven by evaporation at the surface, which is known as the major transport mechanism in the in-situ photolysis of a soil contaminated with 2,3,7,8-tetrachlorodibenzo-p-dioxin(TCDD). A finite-element model was proposed to incorporate the effects of multiphase flow on the distribution of each fluid, gravity as a driving force, and the use of hysteretic models for more accurate description of k-S-p relations. Extensive numerical calculations were performed to study fluid flow through three types of soils under different water table conditions. Predictions of relative permeability-saturation-pressure (k-S-p) relations and fluids distribution for an illustrative soil indicate that hysteresis effects may be quite substantial. This result emphasizes the need to use hysteretic models in performing flow simulations including reversals of flow paths. Results of additional calculations accounting for hysteresis on the one-dimensional unsaturated soil columns show that gravity affects significantly on the flow of each fluid during gravity drainage, solvent injection, and evaporation, especially for highly permeable soils. The rate and duration of solvent injection also have a profound influence on the fluid saturation profile and the amount of evaporated solvent. Key factors influencing water drainage and solvent evaporation in soils also include hydraulic conductivity and water table configuration.

구배가 없는 신배수시스템의 제안 및 배수유동 특성에 관한 실험적 연구 (The Proposal of a New Drainage System without Incline of Piping and Experiment on Drainage Flow Characteristics)

  • 차영호;이정재
    • 설비공학논문집
    • /
    • 제17권5호
    • /
    • pp.452-458
    • /
    • 2005
  • In Korea, pumping pipe using gravity way by water is most popular method in drainage system. But, it is difficult to repair a drainpipe in this method because the drain pipe diameter is increased as using this method. In this research, we propose a new drainage system. The system aim for an adaptedness with buildings, freedom of plan, construction and renewal in water pipe equipments, etc. The new system is not need of incline of piping, and it uses drainage power that is changed potential energy by high velocity flow as making Siphonage at vertical pipe. Therefore, the diameter of piping can decreased than existing piping system established in the ceiling. Also because connecting position will be located at the lower part, it is changed the potential energy of drainage to the high velocity flow. In addition, drainage will be smooth because the fixture drain is linked by each drain pipes.

고온 고압 스팀을 주입하는 SAGD 공정에서 FeOX 무기첨가제가 오일샌드 회수율에 미치는 영향 (Effect of FeOX Inorganic Additive in SAGD Process for Oil Sand Recovery)

  • 송병진;유난숙;김지만;이철위
    • 공업화학
    • /
    • 제25권1호
    • /
    • pp.113-115
    • /
    • 2014
  • 박층의 오일샌드에서 비투멘 성분 회수를 위한 steam assisted gravity drainage 공정에서 무기첨가제 도입에 따른 오일 회수율 특성을 평가하고자 실험실 규모의 모사장치를 이용하여 모사된 오일샌드에서 오일성분을 회수하는 실험을 수행하였다. 오일샌드 모사를 위해 비투멘과 성질이 유사한 초중질유와 직경 1.5 mm의 글래스비드를 사용하였다. 무기합성법을 통해 $FeO_X$를 제조하여 무기첨가제로 도입하였다. 그 결과 시간에 따른 스팀의 열전달 속도는 무기첨가제 도입에 따라 약 40% 증가하였으며, 회수율 또한 약 30% 증가하였다.

EXACT SOLUTION FOR STEADY PAINT FILM FLOW OF A PSEUDO PLASTIC FLUID DOWN A VERTICAL WALL BY GRAVITY

  • Alam, M.K.;Rahim, M.T.;Islam, S.;Siddiqui, A.M.
    • Journal of the Korean Society for Industrial and Applied Mathematics
    • /
    • 제16권3호
    • /
    • pp.181-192
    • /
    • 2012
  • Here in this paper, the steady paint film flow on a vertical wall of a non-Newtonian pseudo plastic fluid for drainage problem has been investigated. The exact solution of the nonlinear problem is obtained for the velocity profile. Also the average velocity, volume flux, shear stress on the wall, force to hold the wall in position and normal stress difference have been derived. We retrieve Newtonian case, when material constant ${\mu}_1$ and relaxation time ${\lambda}_1$ equal zero. The results for co-rotational Maxwell fluid is also obtained by taking material constant ${\mu}_1$ = 0. The effect of the zero shear viscosity ${\eta}_0$, the material constant ${\mu}_1$, the relaxation time ${\lambda}_1$ and gravitational force on the velocity profile for drainage problem are discussed and plotted.