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박영철,양현수,손재익 ( Young Cheol Bak,Hyun Soo Yang,Jae Ek Son ) 한국화학공학회 1992 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.30 No.1
Gasification of Victoria subbituminous coal was conducted in a 7.5 ㎝-ID atmospheric lab-scale fluidized-bed gasifier with variation of operating conditions such as temperature(800-900℃), char feeding rate(1.6 ㎏/hr), air flow rate(4.33-6.5 ㎏/hr), particle size(0.31 ㎜, 0.6 ㎜), and steam flow rate(0.8-2.5 ㎏/hr). As a result, the mol concentration of H₂ in the product gas was 21.4-8.8%, that of CH₄ was 1.0-0.05%, that of CO was 18.5-7.3%, and that of CO₂ was 18.37-8.44%. The calorific value of product gas was in the range of 1,308 ㎉/㎥ to 500 ㎉/㎥, and carbon conversion was in the range of 71% to 94%.
박영철,양현수,손재익 ( Young Cheol Bak,Hyun Soo Yang,Jae Ek Son ) 한국화학공학회 1992 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.30 No.3
The numerical analysis for the 7.5 ㎝ I. D. atmospheric lab. scale fluidized bed coal gasifier was conducted with the bubble assemblage model for gas, the population balance model for solid, and the basic coal gasification kinetic equation in the form of power law. The mole percent of H₂ in the product gas was 10-30%, that of CO was 5-20%, that of CO₂ was 6-12%, and that of CH₄ was 2-4% with variation of the simulation condition such as temperature(750-1000℃), air flow rate(1.5-5.0 ㎏/hr-air/㎏/hr-char), and steam flow rate(0.5-2.5 ㎏/hr-steam/㎏/hr-char).
바이오매스 촉매 탄화 및 반탄화 바이오매스의 비등온 연소 반응 특성
박영철 ( Young-cheol Bak ),최주홍 ( Joo-hong Choi ) 한국화학공학회 2018 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.56 No.5
The effects of catalysts addition on the carbonization reaction of biomass have been studied in a thermogravimetric analyzer (TGA). The sample biomasses were Bamboo and Pine. The catalysts tested were K, Zn metal compounds. The carbonization reactions were tested in the nonisothermal condition from the room temperature to 850 ℃ at a heating rate 1~10 ℃/min on the flowing of N<sub>2</sub> purge gases. Also, the effects of catalyst on the torrefaction were tested in the temperature condition of 220, 250, 280 ℃ at 30 min. Combustion characteristic for the torrefied catalyst biomass were studied in the nonisothermal conditions of 200~850 ℃. As the results, the initial decomposition temperatures of the volatile matters (T<sub>i</sub>) and the temperature of maximum reaction rate (T<sub>max</sub>) were decreased with increasing the catalyst amounts in the sample biomass. The char amounts remained after carbonization at 400 ℃ increased with the catalyst amounts. Therefore catalysts addition can be decreased the energy for carbonization process and improved the heating value of product char. The catalysts reduced the optimum torrefaction conditions from 250 ℃ to 220 ℃. The torrefied catalyst biomass have lower activated energy from 46.5~58.7 kJ/mol to 25.1~27.0 kJ/mol in the nonisothermal combustion reaction.
박영철(Young Cheol Bak),최주홍(Joo Hong Choi) 大韓環境工學會 2016 대한환경공학회지 Vol.38 No.3
대나무를 원료로 탄화 및 활성화 온도 900℃에서 대나무 활성탄을 만들고, 이 대나무 활성탄에 금속 구리와 금속 은을 담지시켜 금속 담지 대나무 활성탄을 제조하였다. 제조된 금속 담지 활성탄의 비표면적 및 세공분포 등의 물리적 특성을 분석하였다. 또한 폐 대나무 활성탄의 재활용을 위하여 대나무활성탄과 NO 기체의 반응 특성 실험을 열중량분석기를 사용하여 반응 온도 20~850℃, NO 농도 0.1~1.8 kPa 변화 조건에서 하였다. 실험 결과, 대나무 활성탄 특성 분석에서 구리 담지 대나무 활성탄에서는 구리 담지량이 증가할수록 세공 부피와 표면적이 감소하였다. 비등온과 등온 NO 반응에서는 전체적으로 구리 담지 대나무 활성탄[BA(Cu)]이 대나무 활성탄[BA]에 비하여 반응속도가 향상되는 것을 볼 수 있었다. 그러나 은 담지 대나무 활성탄[BA(Ag)]은 반응이 억제되는 것을 볼 수 있었다. NO 반응에서의 활성화에너지는 80.5 kJ/mol[BA], 48.5 kJ/mol[BA(Cu)], 66.4 kJ/mol[BA(Ag)]로 나타났고, NO 분압에 대한 반응차수는 0.63[BA], 0.92[BA(Cu)]이었다. The metal-impregnated activated carbon was produced from bamboo activated carbon by soaking method of metal nitrate solution. The carbonization and activation of raw material was conducted at 900℃. 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 as de-NOx agents of used activated carbon. Carbon-NO reactions were carried out with respect to reaction temperature (20℃~850℃) and NO gas partial pressure (0.1 kPa~1.8 kPa). As results, the specific volume and surface area of bamboo activated carbon impregnated with copper were decreased with increasing Cu amounts of activated carbon. In NO reaction, the reaction rate of Cu impregnated bamboo activated carbon[BA(Cu)] was promoted to compare with that of bamboo activated carbon[BA]. But the reaction rate of Ag impregnated bamboo activated carbon[BA(Ag)] was retarded. Measured reaction orders of NO concentration and activation energy were 0.63[BA], 0.92[BA(Cu)], and 80.5 kJ/mol[BA], 48.5 kJ/mol[BA(Cu)], 66.4 kJ/mol[BA(Ag)], respectively.