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석탄화력 발전용 초임계 CO<sub>2</sub> 브레이튼 사이클의 민감도 해석
임동렬,박성호,염충섭,신중욱 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
초임계 CO<sub>2</sub> 브레이튼 사이클은 작동 유체인 CO<sub>2</sub>가 저압 영역부터 고압 영역까지 모두 초임계 상태인 발전 사이클이다. 초임계 CO<sub>2</sub>는 고온 열원을 이용하여 가열된 후 발전용 터빈을 구동하며, 터빈에서 배출되는 초임계 CO<sub>2</sub>는 저온의 열침에서 냉각된 후 압축기에서 가압되어 고온 열원으로 다시 보내지는 밀폐형 브레이튼 사이클이다. 초임계 상태의 CO<sub>2</sub>는 액체와 유사한 밀도를 가지고 기체와 비슷한 점성을 가지며, 초임계 CO<sub>2</sub> 브레이튼 사이클의 압축비가 기존의 증기 랭킨 사이클에 비하여 매우 작기 때문에 초임계 CO<sub>2</sub> 브레이튼 사이클의 설비 규모 소형화가 가능하다. 본 연구에서는 국내 표준 석탄화력발전 적용과 기존의 초임계 증기 랭킨 사이클 대체를 목표로 하여, 상용 공정해석 Code를 이용한 주요 파라미터의 민감도 분석을 실시하였으며 이를 통하여 초임계 CO<sub>2</sub> 브레이튼 사이클의 최적 운전 조건을 제시하고자 한다.
임동렬,이상규 한국유체기계학회 2005 한국유체기계학회 논문집 Vol.8 No.5
Experimental study was conducted to increase the oxygen transfer efficiency of air diffusers in clean water. By measuring the bubble size from the bubbly two-phase flow visualization with several air diffusers, the size of air bubbles near the top surface of aeration tank seems to be independent on the diffuser types. Considering design parameters for the better break-up of larger bubbles around the air diffusers, advanced conceptual air diffusers using nozzle-type throat showing the higher oxygen transfer efficiencies were made.
직접 접촉식 4단 유동층 열교환기의 압력손실 및 열전달 특성
임동렬,박상일,전광민 대한기계학회 1992 대한기계학회논문집 Vol.16 No.2
In this work, direct contact 4-stage fluidized bed heat exchanger is experimentally studied to develop a new type of heat exchanger which recovers the energy contained in the high temperature waste gas exhausted from the industrial furnaces. A sand is used as a heat transfer medium in this experiment. To determine the optimum operating condition, 11 different perforated plates which have a different free area ratio with different hole diameter are used in the experiment. From the room temperature experiment, the pressure drop which is caused by fluidized bed formation is observed. The high temperature experiment is carried out to seek the optimum operating condition of high heat efficiency at low heat exchanger operation cost. The results of experiment are as following. The pressure drop in the high temperature condition can be predicted from the results of the room temperature experiment. And Nusselt number becomes smaller due to the increased interference between sand particles as Reynolds number increases when the dilute phase fluidized beds are formed in nigh temperature condition. But heat transfer amount through the total sand surface area become larger due to the large resident amount of sand. Considering the heat transfer amount and the heat exchanger operation cost, perforated plates which have either a 30% or 35% of free area ratio with 15mm of hole diameter are best fitted for our goal of this work. The values of .phi. which is a dimensionless number representing the absorption heat amount per unit sand rate are in the range from 0.4 to 0.5, when Reynolds number of waste gas ranges from 25-30 with these perforated plates.
임동렬(Dong-Ryul Rhim),이상규(Sang-Kyoo Lee),김민정(Min-Jung Kim),정재우(Jae-Woo Chung),강우(Woo Kang) 한국유체기계학회 2007 유체기계 연구개발 발표회 논문집 Vol.- No.-
Swirl flow characteristics in a DI diesel engine as a reference engine of an HCCI engine development were numerically analysed. Moving meshes for the unsteady conditions were generated with the help of a commercial CFD code. Unsteady swirl flow analyses were conducted with the combination of 3 intake port inlets, then the results of air flow velocity distributions and swirl ratio for an analytic case were compared with the results form the other cases. Strong usability and possibility of unsteady CFD methods for the intake port design of diesel engine as a reference engine of an HCCI engine were suggested in the current study.
임동렬(Dong-Ryul Rhim),이상업(Sang-Up Lee),이상규(Sang-Kyoo Lee),김민정(Min-Jung Kim),김숭기(Soong-Kee Kim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
Numerical study has been conducted for improving air flow characteristics in the exhaust aftertreatment system of diesel-fueled passenger cars by changing length and shape of a DPF diffuser using a commercial CFD code. The results of axial velocity and static pressure distributions along with air flow uniformity results show that a diffuser shape like 2D or 3D function type is proposed for the better air flow patterns in front of a DPF.
임동렬(Dong-Ryul Rhim),이상규(Sang-Kyoo Lee),김민정(Min-Jung Kim),이상업(Sang-Up Lee),곽성순(Sung-Soon Kwak),서정일(Jeong-Il Seo) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Analyses of the heat transfer and thermal stress on an exhaust manifold ofa heavy-duty diesel engine were conducted by using a conjugate heat transfer method. The temperature distribution and heat transfer coefficients at the walls of the exhaust manifold were estimated from the results of exhaust gas flow analysis. Thermal deformations of the exhaust manifold due to the uneven temperature distribution were studied with a structural analysis.