증기 메탄 개질 반응의 Ru 촉매 Kinetic Parameter 예측

주종효,김명준,조형태,이재원,김정환 한국수소및신에너지학회 2022 한국수소 및 신에너지학회논문집 Vol.33 No.5

This study proposes kinetic parameters of Ru catalyst for steam methane reforming (SMR). First, extensive experiments are performed under different SMR conditions to evaluate performance of the catalyst in SMR. Second, a kinetic model is designed and developed for parameter estimation and validation using gPROMS. Finally, estimated parameters are fitted to the kinetic model and then, the model results are compared with the experimental data. The model results are in a good agreement with the experimental data.

gPROMS 를 이용한 가스터빈 복합화력발전 동적 성능 모델링 기법 개발

이동훈(Donghun Lee),고대호(Daeho Ko),오민(Min Oh),김신혁(Synhyuk Kim),Kofi Sarpo Oware 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12

Dynamic modeling of gas turbine combined cycle power plant was studied to analyze and simulate the performance, efficiency and dynamic behavior of the plant using process simulation technique. gPROMS process model builder was applied to describe and simulate the plant performance and some mathematical models were also established for gas turbine, HRSG and steam turbine parts. The gas turbine model consists of specific sub-models of compressor, combustor and turbine respectively to build rigorous model and for each component. Bottoming cycle including HRSG and steam turbine were also modeled to simulate their performance and dynamic behavior sophisticatedly. Finally, a combined cycle power plant performance and dynamic simulator was embodied in gPROMS model builder with characteristics of open source coding, flexible mathematical modeling and graphical user interface.

Separation of Racemic Bupivacaine Using Simulated Moving Bed with Mathematical Model

Choi, Young-Jae,Han, Soon-Koo,Chung, Sung-Taik,Row, Kyung-Ho Korean Society for Biotechnology and Bioengineerin 2007 Biotechnology and Bioprocess Engineering Vol.12 No.6

Utilizing a Simulated Moving Bed (SMB), the conditions for separating bupivacaine enantiomers, a racemic local anesthetic, were determined by triangle theory and simulations using the gPROMS software and the Aspen Chromatography package. The 5MB model in this study assumed an axial dispersion flow for the liquid phase and the intraparticle mass transfer was described in terms of a simple Linear Driving Force (LDF) approximation. The parameters (a and b) of the Langmuir Adsorption Isotherm (LAI) were determined using a dynamic method. In the optimal condition the calculated concentrations were confirmed by the experimental results. Values projected by the gPROMS software more closely matched experimental values than those projected by the Aspen Chromatography package.

Sensitivity test of low rank Indonesian coal utilization using steady state and dynamic simulations of entrained-type gasifier

Lisandy, Kevin Yohanes,Kim, Ryang-Gyoon,Hwang, Chan-Won,Jeon, Chung-Hwan Elsevier 2016 Applied Thermal Engineering Vol.102 No.-

<P><B>Abstract</B></P> <P>Gasification is a process in which a solid fuel is transformed into a gas, which acts as a useful energy source. Coal gasification provides a wide range of products such as chemical, power, liquid, and gaseous fuels. A simulation study was undertaken to calculate the composition, mass flow rate, temperature, pressure of syngas, ash slag layer thickness, heat dissipation from the reactor, and carbon conversion of the coal under steady state conditions. The effect of changes in the input parameters such as the changes in the O<SUB>2</SUB> and H<SUB>2</SUB>O to coal ratios, operating temperature, and most importantly the change in the fuel, was considered. Besides steady state simulations, dynamic simulations were also conducted to predict the starting and shutdown conditions of the gasifier. The g-proms process modeling software was utilized to conduct the simulations based on mathematical equations, which are capable of calculating time dependent derivatives. In order to obtain the actual physical and chemical properties of coal and its ash, as well as the reaction kinetics of coal, some experiments were performed. Proximate analysis, elemental analysis, and coal pyrolysis, combustion and gasification kinetics were conducted using thermogravimetry (TGA), elemental analysis method (EA), and a pressurized wire mesh heating reactor (PWMR), respectively. Ash viscosity and ash mineral composition were determined using rheometer and X-ray fluorescence (XRF), respectively. The results of these experiments were fitted into the model and served as input for the calculations. Berau and Kideco are low rank Indonesian coals with different characteristics. The results showed major problems associated with slag tapping in the case of Kideco coal. On the other hand, Berau coal performed without any issues.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The de-volatilization and char reaction kinetics for simulation input were analyzed. </LI> <LI> The viscosity variations over temperature was obtained by utilizing a rheometer. </LI> <LI> Considering diffusion effect and RPM, the intrinsic reaction kinetics was obtained. </LI> <LI> The numerical model for gasifier slag mechanism was developed. </LI> <LI> Dynamic simulation for the shell entrained-type gasifier were developed. </LI> </UL> </P>

회수 Cyclotol의 비군사화를 위한 소각공정

이시황,백승원,문일,박정수,김현수,오민,Lee, Si-Hwang,Baek, Seung-Won,Moon, Il,Park, Jung-Su,Kim, Hyoun-Soo,Oh, Min 한국군사과학기술학회 2016 한국군사과학기술학회지 Vol.19 No.4

Demilitarization involves the disposal and recovery of obsolete explosives or ammunition. Cyclotol has been used as a military explosive along with RDX and HMX. A limited number of processes exist for safe disposal due to their sensitivity to thermal shock. Rotary kilns are widely used for thermal decomposition in many countries due to cost effectiveness and simplicity compared with supercritical oxidation. Phase change as well as condensed phase reactions(CPRs) and gas phase reactions(GPRs) with rates described by the Arrhenius equation of cyclotol has been considered in this work. Changes in gas fraction, reaction rate and mass of explosives were predicted at 490, 505 and 575 K. A maximum temperature of 2062 K has been predicted within the reactor at an initial temperature of 575 K due to GPRs. From this research, Thermal decomposition in the rotary kiln is plausible for demilitarization.

수학적 모델링 방법에 기초한 복합발전 공정의 정상상태 모사시스템 개발

김신혁 ( Shin Hyuk Kim ),이시황 ( Lee Si Hwang ),주용진 ( Yong Jin Joo ),이상욱 ( Sang Uk Lee ),손병모 ( Byung Mo Shon ),오민 ( Min Oh ) 한국화학공학회 2015 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.53 No.5

Process modeling and simulation is a powerful methodology to quantitatively predict the change of processvariables when operating and design conditions are changed. In this study, considering drawbacks of currently used process simulator for combined cycle plants, we developed process modeling system equipped with an ease of use and flexibility for model development. For this purpose, the analysis of combined cycle processes was carried out and consequently, mathematical models and libraries were developed. Furthermore, in view of the fact that the level of the abstraction of process models depends on the purpose of simulation as well as the available data, simple and rigorous models were also developed for some important units. In use of reference combined plant, we executed process simulation using the developed modeling system and the comparison was made between the results of simulation and the reference data. Less than 1% marginal error was identified and we concluded that the modeling system can be applied forcommercial combined cycle processes.

폴리제너레이션 성능 모사 연구

이시황,보닷윙,이건희,정민영,전락영,오민 한국수소및신에너지학회 2017 한국수소 및 신에너지학회논문집 Vol.28 No.4

Polygeneration process is widely used to pursuit high efficiency by sharing electricity, utility, refrigeration and the utilization of product chemicals. In this paper, performance analysis of the 450 MW Class polygeneration process was conducted with various syngas generated from coal and biomass gasifier. WGSR and PSA process were employed for hydrogen production and separation. Process modeling and dynamic simulation was carried out, and the results were compared with NETL report. Net power of the polygeneration process was 439 MW considering power consumption. More than 90% of CO was converted at WGSR and the hydrogen purity of PSA was more than 99.99%.

은염을 포함하는 고분자 전해질 막을 통한 올레핀 촉진수송의 해석

Yong Soo Kang,Dongkyun Ko,Jong Hak Kim,Sung Taik Chung 한국막학회 2003 멤브레인 Vol.13 No.4

본 연구에서는 은-고분자 전해질 막에서의 프로필렌/프로판에 대한 순수 기체 선택도 (~10,000)와 혼합기체 선택도(~40)의 큰 차이의 원인을 규명하였다. 먼저 기체 공급 조건이 혼합기체의 투과도와 분리 성능에 미치는 영향을 고찰하였다. 프로필렌의 농도가 감소함에 따라 고분자 전해질 막을 통한 프로필렌의 투과도는 감소하고, 프로판의 투과도는 증가를 하였으며, 그 결과 프로판/프로필렌의 선택도가 감소하였다. 이는 고분자 전해질막의 프로필렌에 의한 가소화에 의한 것임을 실험적 결과 및 수학적 모델에 의해서 확인하였다. 또한, 압력과 무관한 투과도를 사용하였을 때의 이론적 계산에 의한 막 분리 성능은 실험치와 비슷하게 나왔음을 알 수 있었다. The origin of large difference of selectivity of C3H6 over C3H8 between pure gas and mixed gas through silver polymer electrolyte membranes is investigated. Firstly, the effect of feed condition on the permeance of mixture gas (C3H6/C3H8) and the separation performance is examined. Upon decrease of the C3;H6 concentration, the C3H6 permeance decreased whereas the permeance of C3H8 increased, resulting in the decrease of the selectivity of C3H6/C3H8/. This result is ascribed to the C3H6-induced plasticization of membranes. Experimental results were validated by means of mathematical modeling, where pressure independent permeabilities were used.