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박영철 경상대학교 환경보전연구소 1996 環境保全硏究所報 Vol.4 No.1
Nonisothermal calcination experiments of domestic limestones and dolomites were conducted by using horizontal thermogravimetric analyzer in a flowing nitrogen gas, and the Kissinger, Freeman-Carroll, Chatterjee-Conrad, Friedman and Ozawa method were used to compare the reactivity. The values of activation energy obtained from the several techniques exists in the range from 149.2 kj/g-㏖ to 215kj/g-㏖. Measured reaction orders for solid reactant are 0.4 to 0.8. Among all of those methods, Freeman-Carroll and Friedman method is useful for the thermal analysis of inorganic materials.
黑鉛을 이용한 排煙가스 窒素 酸化物 除去 工程 基礎 反應 特性 硏究
朴英喆 慶尙大學校生産技術硏究所 1997 生産技術硏究所論文集 Vol.13 No.-
Thermal analyses were conducted in a thermogravimetric analyzer by isothermal technique in order to characterize the carbon-nitrogen oxides reaction. The tested carbon samples were SP-1 graphite and Micro 450 graphite. Cabon-NO and carbon-N₂O reaction were carried out with respect to isothermal reaction temperature(550℃-900℃) and partial pressure(5kPa-20kPa) of reactant gas. In NO reaction, measured reaction orders of NO concentration activation energy were 0.46-0.92 and 85kJ/mol-102 kJ/mol, respectively. In N₂O reaction, measured reaction orders of N₂O concentration and activation energy were 0.55-1.35 and 167kJ/mol-190 KJ/mol, respectively.
朴英喆 慶尙大學校生産技術硏究所 1993 生産技術硏究所論文集 Vol.9 No.-
Thermal analyses were conducted by isothermal technique in order to characterize the hydrogen reduction reaction of iron ores and zinc ferrite sorbent. Reduction reactions were carried out with respect to various factors. : sorbents particle size(0.075-0.85mm), isothermal reaction temperatures(500-600℃), and hydrogen concentration(7.1-12.8%). Measured reaction orders of hydrogen concentration and activation energy were 0.9-1.0 and 66.8-83.9 kJ/g-mol, respectively. The kinetic equatration of hydrogen reduction reaction of ferric sorbents was correlated with various factor.
열분석법에 의한 수입 코우크스탄의 건류 반응열과 반응 특성 연구
박영철,이성수 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.4
열중량분석(TGA)과 시차주사열량분석(DSC)을 이용한 석탄의 건류반응 실험을 하였고, 이들 반응의 kinetics와 반응열을 분석하였다. 사용한 석탄은 수입 역청탄으로 미국 Clintwood탄(CW), 호주 Goonyella탄(GY)과 중국 Tianchen탄(TH)이었다. 헬륨 가스 100mL/min 분위기에서 가열속도 1-10℃/min 범위의 조건에서 상온에서 950℃까지 비등온 실험을 하였다. 건류반응 TGA 실험치 해석에는 미분법인 Kissinger, Freeman-Carroll, Chatterjee-Conrad법과 적분법을 적용하고, DSC 실험치 해석에는 Borchardt-Daniel법을 적용하였다. TGA 실험치 해석법으로는 Chatterjee-Conrad법이 가장 유효하였고, 건류반응 활성화에너지는 61.2-65.9 kJ/g-mol, 석탄량에 대한 반응차수는 0.92-1.29이었다. DSC의 반응열을 이용한 Borchardt-Daniel법의 경우 건류반응 활성화에너지가 39.5-56.0 kJ/g-mol, 반응차수는 0.98-1.05로 나타났다. 상온에서 1,000℃까지 건류에 필요한 열량은 CW탄 828 J/g, GY탄 823 J/g, TH탄 1,077 J/g으로 나타났다. Carbonization reactions were studied experimentally in thermogravimetric analyzer (TGA) and differential scanning calorimeter (DSC), and the reaction kinetics obtained by serveral analysis methods were compared. The sample coals were U.S.A. Clintwood (CW), Australia Goonyella (GY), and China Tianchen (TH) bituminous coal. About 10-15㎎ samples were nonisothermally heated from 30 ℃ to 950 ℃ in the flow of 100 mL/min. He gas with various heating rates such as 1 ℃/min, 3 ℃hin, 5 ℃/min, and 10 ℃/min. TGA data were analyzed by using the differential methods of Kissinger, Free-man-Carroll, and Chatterjee-Conrad method, and integral method. DSC data were also analyzed by using the Borchardt-Daniel method. The Chatterjee-Conrad method was the most effective method for the analysis of TGA carbonization data in these experimental conditions. Activation energies of carbonization reaction were calculated as 61.2-65.9 kJ/g-㏖, and the reaction orders were 0.92-1.29. For the DSC data, the activation energies of carbonization reaction by using the Borchardt-Daniel method were 39.5-56.0 kJ/g-㏖, and the reaction orders were 0.98- 1.05. The carbonization heat requirement from a room temperature to 1,000 ℃ were 828 J/g(CW coal), 823 J/g(GY coal), and 1,077 J/g(TH coal).
Matlab을 이용한 유성음 성도단면의 실시간 분석기 구현
권오영,박일서,조철우 국립7개대학공동논문집간행위원회 2003 공업기술연구 Vol.3 No.-
In this paper we tried to compute the shape of the vocal tract from the input speech in real-time. To implement the real-time process MATLAB Data Acquisition Toolbox was used. Implemented program can compute and display the shape of the vocal tract from the various input speech signal.
박영철 ( Young Cheol Bak ),최주홍 ( Joo Hong Choi ),이근림 ( Geun Lim Lee ) 한국화학공학회 2014 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.52 No.6
대나무를 원료로 탄화 및 활성화온도 900 ℃에서 대나무 활성탄을 만들고, 이 대나무 활성탄을 질산은 수용액에 침지시켜 은첨착 대나무활성탄을 제조하였다. 0.002~0.1 mol/L 농도의 질산은 수용액에서 농도변화와 시간 변화 조건에서 은첨착실험을 하였다. 제조된 첨착활성탄의 은첨착량, 비표면적 및 세공분포 등의 물리적 특성을 분석하였다. 또한 폐대나무활성탄의 재활용을 위하여 대나무활성탄과 NO 기체의 반응 특성 실험을 열중량분석기를 사용하여 반응온도20~850 ℃, NO 농도 0.1~1.8 kPa 변화 조건에서 하였다. 실험 결과, 첨착시간 2시간 내에 은첨착이 완료되었고, 질산은 수용액 농도가 0.002~0.1 mol/L로 증가됨에 따라 은첨착량은 1.95 mg Ag/g 활성탄(0.2%)~88.70 mg Ag/g 활성탄(8.87%)로 증가되었다. 대나무 활성탄 특성 분석에서 은첨착량이 증가할수록 세공 부피와 표면적은 은첨착 0.2%일 때 최대이고 은첨착량이 증가할수록 세공체적이 감소하였다. 비등온과 등온 NO 반응에서는 전체적으로 은첨착대나무활성탄[BA(Ag)]이 대나무활성탄[BA]에 비하여 반응이 억제되는 것을 볼 수 있다. NO 반응에서의 활성화에너지는 80.5kJ/mol[BA], 66.4 kJ/mol[BA(Ag)]로 나타났고, NO 분압에 대한 반응차수는 0.63[BA], 0.69l[BA(Ag)]이었다. The Ag-impregnated activated carbon was produced from bamboo activated carbon by soaking method of silver nitrate solution. The carbonization and activation of raw material was conducted at 900 oC. Soaking conditions are the variation of silver nitrate solution concentration (0.002~0.1 mol/L) and soaking time (maximum 24 h). The specific surface area and pore size distribution of the prepared activated carbons were measured. Also, NO and activated carbon reaction were conducted in a thermogravimetric analyzer in order to use for de-NOx agents of used activated carbon. Carbon-NO reactions were carried out with respect to reaction temperature (20~850 oC) and NO gas partial pressure (0.1~1.8 kPa). As results, Ag amounts are saturated within 2h, Ag amounts increased 1.95 mg Ag/g (0.2%)~ 88.70 mg Ag/g (8.87%) with the concentration of silver nitrate solution in the range of 0.002~0.1 mol/L. The specific volume and surface area of bamboo activated carbon of impregnated with 0.2% silver were maximum, but decreased with increasing Ag amounts of activated carbon due to pore blocking. In NO reaction, the reaction rate of impregnated bamboo activated carbon was retarded as compare with that of bamboo activated carbon. Measured reaction orders of NO concentration and activation energy were 0.63[BA], 0.69l[BA(Ag)] and 80.5 kJ/mol[BA], 66.4 kJ/mol[BA(Ag)], respectively.