CAJ | 학술논문

利用水分再吸收实验装置测定了印尼褐煤在30℃和40℃下的等温脱附(吸附)曲线，研究粒径和干燥温度对褐煤吸湿特性的影响；利用多孔介质等温吸附热力学原理，计算得到了印尼褐煤的等温吸附热。结果表明：印尼褐煤等温吸湿曲线的形状是典型的可冷凝蒸汽在孔隙物质中物理吸附的 S 型；干燥后的印尼褐煤平衡水分(equilibrium moisture content, EMC)与粒径无关，而与干燥温度有关，随着干燥温度的提高，平衡水分降低。印尼褐煤的等温吸附热随着平衡水分的增大而降低，当EMC<7%时，干燥煤的吸附热略高于水的蒸发潜热，可以推断水分子在干燥褐煤孔隙表面再吸附机理是水分子物理吸附在褐煤孔隙表面形成体相水和毛细水，没有与煤的表面官能团形成氢键。
이용수분재흡수실험장치측정료인니갈매재30℃화40℃하적등온탈부(흡부)곡선，연구립경화간조온도대갈매흡습특성적영향；이용다공개질등온흡부열역학원리，계산득도료인니갈매적등온흡부열。결과표명：인니갈매등온흡습곡선적형상시전형적가냉응증기재공극물질중물리흡부적 S 형；간조후적인니갈매평형수분(equilibrium moisture content, EMC)여립경무관，이여간조온도유관，수착간조온도적제고，평형수분강저。인니갈매적등온흡부열수착평형수분적증대이강저，당EMC<7%시，간조매적흡부열략고우수적증발잠열，가이추단수분자재간조갈매공극표면재흡부궤리시수분자물리흡부재갈매공극표면형성체상수화모세수，몰유여매적표면관능단형성경건。
Using the moisture re-adsorption experimental rig, the desorption and adsorption isotherms of an Indonesian lignite were studied at the temperature of 30℃and 40℃. The effect on moisture re-adsorption characteristics of coal particle size and drying temperature were studied. According to the principle of thermodynamics of porous media isothermal adsorption, the Indonesian lignite isothermal adsorption heat was calculated. The results show the irreversibility of the moisture desorption and adsorption isotherms of the coal in the desorption-adsorption cycles, indicating that the irreversible coal structure changes during drying conditions, which is dependent on drying temperature and independent of the coal particle size. The equilibrium moisture content decreased with the increasing drying temperature. The adsorption heat is a little higher than the latent heat of evaporation while the equilibrium moisture content is more than 7%. The water vapor is physically adsorbed on the particle surface and capillary pore surfaces. The formation of hydrogen bond between the water molecules and the surface functional groups during the moisture re-adsorption process is not evident.