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통기도 실험에 의한 점결탄 혼탄시 연화용융 및 팽창 특성 분석
황찬원(ChanWon Hwang),오택림(ZeLin Wu),류광일(KwangIl Ryu),김량균(RyangGyoon Kim),전충환(ChungHwan Jeon) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
The experiment was designed to study the coking coal swelling characteristics as a function of particle size distribution and density under thermal shock. During the cokes making process, coking coal pass through the fluidity zone at specific temperature. Cokes characteristics can be caused by physicochemical properties at fluidity zone. Three kinds of coking coal was used for experiment and each coal has different swelling characteristics. Softening and swelling characteristics was analyzed through the permeability test. Permeability test was performed by measuring the differential pressure of nitrogen. Finally, It compared blending effect by the swelling characteristics. Three kinds of coking coal was blended A with D and D with G in specific ratio. Coal D is standard of comparison. As a result, D:A blended coking coal has generally low permeability characteristics (1.0~1.2bar). Because It strongly combined with each particle after mesophase zone. This characteristic derives from FSI and volatile matter contents. And D:G blended coking coal test results seem to decrease with coal Gcontents. It means, coal G has not sufficient swelling characteristics.
외부 및 내부 확산을 적용한 인도네시아 석탄촤의 연소 반응율 분석
황찬원 ( Chan Won Hwang ),김량균 ( Ryang Gyoon Kim ),류광일 ( Kwang Il Ryu ),오택림 ( Ze Lin Wu ),전충환 ( Chung Hwan Jeon ) 한국화학공학회 2014 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.52 No.1
본 연구의 목적은 국내 화력발전소에서 사용중인 인도네시아 석탄촤의 연소반응율을 연구하는 것이다. 석탄촤의 반응율은 External, Internal effectiveness factor를 고려하여 입자 내부 및 외부확산을 정량적으로 정리하였으며, Random pore model을 사용하여 탄소변환율에 따른 입자내부비표면적의 변화를 반영하였다. 가열 및 측정이 가능한 WHR(Wire Heating Reactor)를 활용하여 반응시간을 측정함으로써 석탄촤의 반응율을 도출하였고 BET(Brunauer-Emmett-Teller) 및 TGA(Thermo-Gravimetric Analysis) 장비를 활용하여 석탄촤의 물리적인 특성인 내부비표면적과 Random pore model 의 구조변수(ψ)를 측정하였다. 석탄 종에 따른 활성화에너지 및 빈도인자를 도출하기 위해 아역청탄인 BARAMULTI, ENERGYMAN, AGM탄을 사용하였다. 본 연구 결과에서 External, Internal effectiveness factors를 통해 확산에 따른 kinetics를 비교한 결과 외부 확산 보다 내부 확산의 영향이 지배적임을 확인하였다. 최종적으로 내부 및 외부 확산에 대한 영향을 고려한 3종의 석탄촤 Intrinsic kinetics의 활성화에너지는 110~118 kJ/mol의 값을 보였다. The experiment was designed to compare the char combustion kinetics of pulverized Indonesia coals commonly utilized in Korea power plants. The reaction rate of coal char has been formulated using the external and internal effectiveness factors to describe the diffusion effect quantitatively. The Random Pore Model (RPM) was used for applying internal specific surface area as a function of carbon conversion ratio. Reaction rate was obtained from reaction time using the Wire Heating Reactor (WHR) which can heat and measure the char particle temperature at the same time. BET and TGA were used to obtain physical properties such as internal specific surface area and structural parameter. Three kinds of Indonesia Sub-bituminous coals "BARAMULTI, ENERGYMAN, AGM" were used in order to derive the activation energy and pre-exponential factor. The results of this study showed that the effect of internal diffusion than that of external diffusion is the dominant as comparison of kinetics was reflected in external and internal effectiveness factors. For three kinds of coal char, finally, activation energy of intrinsic kinetics indicates 110~118 kJ/mol.
고온, 고압조건에서의 인도네시아 석탄촤의 CO<sub>2</sub> 가스화 반응
리산디케빈요하네스,김량균,황찬원,전충환,Lisandy, Kevin Yohanes,Kim, Ryang-Gyoon,Hwang, Chan-Won,Jeon, Chung-Hwan 대한기계학회 2014 大韓機械學會論文集B Vol.38 No.9
A pressurized wire mesh heating reactor (PWMR) can provide high pressure and temperature experimental conditions up to 50 atm and 1750 K, respectively. This equipment was developed to evaluate the intrinsic reaction kinetics of $CO_2$ gasification. A PWMR utilizes a platinum (Pt) wire mesh resistance to generate heat with a direct current (DC) electricity supply. This DC power supply can then be controlled by computer software to reach the exact expected terminal temperature and heating period. In this study, BERAU (sub-bituminous Indonesian coal) was pulverized then converted into char with a particle size of $90-150{\mu}m$. This was used in experiments with various pressures (1-40 atm) and temperatures (1373-1673 K) under atmospheric conditions. The internal and external effectiveness factor was analyzed to determine the effects of high pressure. The intrinsic reaction kinetics of BERAU char was obtained using $n^{th}$ order reaction rate equations. The value was determined to be 203.8kJ/mol. PWMR(Pressurized wire mesh heating reactor)는 Intrinsic $CO_2$ 가스화 반응속도 해석에 필요한 활성화에너지와 빈도상수를 도줄하기 위해서 고안되었으며, 고압 및 고온(50atm, 1750K)조건 하에서 실험을 수행하였다. 본 연구에서는 고온조건에서의 실험을 위해 백금(Pt) 메쉬를 가열체로 사용하였고 직류전원공급기를 통해 백금메쉬로 전류를 인가하여 석탄 입자를 가열시킨다. 가열시 정확한 온도제어 및 반응시간 조절을 위해 직류전원공급기는 컴퓨터로 제어된다. 본 연구에서는, 인도네시아 아역청탄인 BERAU 를 사용하였으며 입자크기는 $90-150{\mu}m$, 압력과 온도조건은 각각 1-40atm 및 1373-1673K에서 실험을 진행하였다. 고압에서의 압력의 영향을 구분하기 위해 Internal/external effectiveness factor를 고려하였다. 최종적으로 BERAU 촤의 Intrinsic 가스화 반응속도론 을 $n^{th}$ order 반응식을 통해 도출하였으며 그 값은 203.8kJ/mol 의 값을 가졌다.