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A Study on Complex Themkodynamic Equilibrium Calculations of Coal Ash Slag Behavior
Juang,BongJin 수원대학교 산업기술연구소 1997 산업기술연구소논문집 Vol.12 No.-
석탄회분 슬래그의 거동은 슬래그의 조성 및 온도의존성이 높기 때문에 석탄을 이용하는 장치, 즉 슬래깅 가스화기, 싸이클론 연소기, 슬래그 탭 보일러 등의 설계 및 성공적인 조업을 위해서 매우 중요한 변수가 될 뿐만 아니라, 이와같은 장치에 사용되는 탄종의 적합성 여부 및 회분의 슬래깅 성향을 판별하는 중요한 선택의 기준을 제공하여 준다. 이와 관련하여 석탄회분이 용융되면서 생성된 슬래그의 액체조성 및 양의 예측은 석탄회분 성분의 화학반응과 생성된 상들의 물성치를 고려하여 계의 총자유에너지를 최소화시키는 열역학적 평형계산을 근거로 INITMOL과 SOLGASMIX 프로그램에 의해 실행되었다.
Ruey Shin Juang,Chun-Lan Yeh 한국생물공학회 2014 Biotechnology and Bioprocess Engineering Vol.19 No.1
The use of macroporous polymeric adsorptionresins for the recovery and purification of prodigiosin fromfermentation broth of Serratia marcescens SMDR wassystematically studied, in which the broth was pretreatedby coagulation with alum and the resulting precipitate wasleached by methanol/water solution. Of the seven resinstested, Diaion HP-20 resin was selected considering theadsorption and desorption abilities for prodigiosin at thesame time. The optimal compositions of liquid phases foradsorption and desorption were also examined. Batchexperiments were performed at 15 ~ 35oC by varying initialprodigiosin concentration in solution (0.05 ~ 0.5 mmol/L),in which molar fraction of each component in the solutionwas kept constant. The Freundlich and Langmuir equationswere used to describe adsorption isotherms and the relatedthermodynamic functions were also determined. Fixed-bedexperiments were finally conducted to obtain the breakthroughcharacteristics for the adsorption and desorption ofprodigiosin. Under optimized conditions, a purificationfactor of prodigiosin of 11.4 could be obtained from thepretreated broth after one adsorption-desorption run in fixedbed. The present results had demonstrated the promisingpotential of HP-20 resins for the recovery and purificationof prodigiosin from methanol/water solution of Serratiamarcescens fermentation broth.
Shueiwan H. Juang,Liang-Jing Fan,Hung Po Ou Yang 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.
A new testing method, dubbed Mold Immersed Rapid Solidification (MIRS), is proposed to investigate the distribution of fly ash particles in ADC6+5wt.% fly ash composites prepared by stir casting. In preparing the composite slurries, the fly ash was preheated at different temperatures, namely 400°C, 500°C, 600°C, 660°C, 700°C and 800°C, and then added into ADC6 melt at different flow rates, namely 0.10 g/s, 0.15 g/s, and 0.2 g/s. The stirring speed and melt temperature were respectively fixed at 300 rpm and 700°C. Optical micrographs reveal that MIRS effectively locks the position of fly ash, allowing investigations of particle dispersibility in the matrix. Further, both hardness and density tests were used to investigate the uniformity of the fly ash distributions in the composites. The experimental results show that higher preheating temperature and lower adding rate of fly ash diminish or avoid porosity induced by particle clustering in the matrix, leading better chemical reactions between fly ash and aluminum melt. The lowest porosity content of 1.04% and the highest Brinell hardness number were obtained in this study with fly ash preheated at 800°C and added at 0.10 g/s. This represents a 20.7% increase in BHN compared with raw ADC6.
Jia-Lin Juang,Hsieh-Lung Hsu 국제구조공학회 2008 Steel and Composite Structures, An International J Vol.8 No.6
This paper presents an effective hysteretic model for the prediction and evaluation of steel reinforced concrete member seismic performance. This model adopts the load-deformation relationship acquired from monotonic load tests and incorporates the double-pivot behavior of composite members subjected to cyclic loads. Deterioration in member stiffness was accounted in the analytical model. The composite member performance assessment control parameters were calibrated from the test results. Comparisons between the cyclic load test results and analytical model validated the proposed method’s effectiveness.