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이시훈,손응권 ( Si Hyun Lee,Eung Kwon Shon ) 한국화학공학회 1994 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.32 No.3
Korean anthracite, JangSung coal, has been treated with molten caustic leaching using several reaction temperatures, NaOH/coal ratios and particle sizes of raw coals. Ash removal rates, variations in combustion temperatures and combustion rates after treatment were investigated by using TGA(Thermogravimetric Analyser). Results for a typical bituminous coal and a foreign anthracite at a fixed condition of 390℃, NaOH/coal ratio of 4 were also compared with that for a JangSung coal. It had been found for JangSung coal that the ash removal rates were 64-88% and the combustion peak temperature lowered about 150℃ after treatment so that the combustion range of treated coal became similar to that of bituminous coal. Variations in particle size, surface area after treatment were measured and the ratio of volatile matter to fixed carbon(VM/FC) representing coal rank were calculated. The relationship between VM/FC ratio and the variations in combustion temperatures after treatment was discussed briefly.
이시훈,손응권,박석환 ( Si Hyun Lee,Eung Kwon Shon,Suk Whan Park ) 한국화학공학회 1995 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.33 No.6
Domestic anthracite and imported bituminous coals were treated according to the molten caustic leaching procedures and changes in their organic structures were investigated. The investigation was conducted through ultimate analysis, functional group analysis using IR/NMR, and vitrinite reflectance measurements and marceral analysis with microphotometer. The results of analyses showed that the H/C ratio and the highly reactive aliphatic hydrocarbon groups linked with aromatic hydrocarbons decreased and the vitrinite reflectance increased with treatment. These are changes observed when carbonization occurs. However, the results of the observation of maceral surface showed that the surface of the organic groups was severely damaged and the anisotropy, which should increase with carbonization, decreased. The decrease in the combustion temperature and the increase in combustion reactivity were attributed to the physical changes on the surface of organic groups rather than to the chemical changes such as break down in the organic groups.
이시훈,박철우,손응권 ( See Hoon Lee,Cheol Woo Park,Eung Kwon Shon ) 한국화학공학회 1992 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.30 No.3
A detailed investigation has been reformed on the thermal characteristics of 28 Korean anthracite coals. The proximate, ultimate and marceral constituents characterizing their chemical and petrographic properties were analysed. The coals were partitioned into four groups in accordance with the linearity of Arrhenius plots and the weighted mean activation energy were calculated. By examining the data obtained, it was possible to show the existence of good correlations between the VM/FC, (C+H)/O and C/H, but it was not possible to detect particular trends with regard to PT(Peak Temperature) and BT(Burn-out Temperature) deduced from burning profiles. It was found that the PT and BT cannot be used as an indices to describe the combustion characteristics of coals having identical rank(especially for anthracite). For the whole set of coals, telocollonite belonging to vitrinite marceral group has the highest correlation coefficient with activation energy. Although both the telocollonite and the desmocollinite belong to vitrinite marceral group, each marceral exert opposite effect on activation energy and the activation energy increased as the total inertinite contents increased. The differences in sulfur content, VM/FC ratio, marceral and activation energy in each groups are compared by using the frequency distribution analysis.
박철우,이시훈,손응권,Park, Cheol-Woo,Lee, See-Hoon,Shon, Eung-Kwon 한국분석과학회 1992 분석과학 Vol.5 No.4
국내의 23개 무연탄을 대상으로 석탄회의 화학분석 및 용융특성분석을 수행하여 석탄회의 화학조성과 용융온도와의 상관성을 고찰하였다. 또한 이들 무연탄을 미분탄 연소의 연료로 사용시 야기될 수 있는 slagging, fouling성을 예측하여 보았다. 국내 무연탄회는 대부분 $SiO_2$와 $Al_2O_3$를 80% 이상 함유하고 있는 반면 1% 이하의 적은 양의 $Na_2O$를 함유하고 있으며, 또한 비교적 높은 용융온도를 갖는다. 따라서 이 무연탄들을 미분탄 연소의 연료로 사용시 slagging 및 fouling 발생 가능성은 낮을 것으로 예측되었다. 국내 무연탄회의 용융특성은 base/acid ratio와 비교적 높은 상관성을 갖는 것으로 나타났다. Chemical composition and fusibility of coal ash were measured for 23 Korean anthracite coals. The relationship between chemical properties and fusion temperature of coal ash was investigated. The slagging and fouling in firing the pulverized coal for boiler was assessed for the coal samples. It was found that most ashes contained more than 80% of $SiO_2$ and $Al_2O_3$ whereas less than 1% of $Na_2O$. And also fusion temperature of ashes occured relatively higher for Korean coals. Therefore it can be predictable that the slagging and fouling formation has a little problem in a pulverized coal firing system. A base/acid ratio did show a good correlation with fusion temperature for these coal ashes.
박철우,박석환,현주수,손응권 ( Cheol Woo Park,Suk Whan Park,Ju Soo Hyun,Eung Kwon Shon ) 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.6
Maceral of coal and reflectance of vitrinite have been determined for the domestic and the imported coals. Also the relationship between chemical and optical properties of coal has been investigated. The maceral of coal samples is composed of both two varieties of collinite and vitrodetrinite in vitrinite group and three varieties of semifusinite, fusinite and inertodetrinite in inertinite group. Micrinite, gaphinite, mottlite and impregnite have been observed in the domestic coals. The degree of coalification for domestic coal is meta-anthracite and that of the imported coal is anthacite. As the macerals in vitrinite group is increased the amount of volatile matter and carbon increased. Also the amount of volatile matter and carbon decreased with increasing macerals in the inertinite group. As the maximum reflectance of vitrinite is increased both, the anisotropy and the carbon composition increased but, the volatile matter and hydrogen decreased.