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Investigation of the effects of demineralization of inherent minerals in Shengli lignite (SL) on its structure and combustion property in the field of coal conversion is an extremely important and interesting topic. In this study, inherent minerals in SL were demineralized by hydrochloric acid (HCl) treatment. Further, the metals cations Na+, Al3+, K+, Ca2+, Mn2+ and Fe3+, corresponding to the inherent...
Hydrothermal dewatering (HTD) is a promising method for in-depth upgrading of lignite because of its comprehensive modifications, including dehydration, deoxygenation, carbonization, and surface modification. The oxygen functional groups in XiMeng lignite before and after HTD was quantitatively determined using the 13C direct polarization/magic angle spinning technique. After HTD, the amounts of carboxyl,...
To upgrade Indonesian lignite by significantly reducing moisture and volatile matter content for the preparation of quality coal water slurry (CWS) gasification fuel, carbonaceous materials with high dielectric permittivity were employed to accelerate heating rate via microwave irradiation. The physicochemical properties of lignite upgraded through microwave irradiation with the addition of activated...
Hydrothermal treatment of Xiaolongtan lignite (XLT) was carried out in a lab autoclave and the pyrolysis was studied in a tube reactor at 873K for 15min. The structure of the lignite was characterized by solid state 13C nuclear magnetic resonance (NMR) and Fourier transform infrared spectroscopy (FTIR). The results show that the lignite structure and pyrolysis product distribution have a significant...
To upgrade Indonesian lignite with high moisture content for generating quality gasification fuel, NaCl was used to improve the permittivity of this lignite, thus enhancing microwave dewatering rate. The dielectric loss factor of lignite with 2.34wt% NaCl increased from 0.190 to 0.311 at 2.45GHz; as a result, the conversion of electromagnetic energy to thermal energy increased by 64%. Furthermore,...
Ximeng lignite (XL) was treated by using different drying methods, namely, conventional, microwave, and combination, to investigate their effects on the grinding characteristics of XL. The controlled mechanisms that improved the grindability of XL treated by different drying methods were analyzed with proximate analysis and scanning electron microscope. Results showed that the removal moisture and...
This study is aimed to examine the utilization of wastewater produced from the microwave irradiation upgrading process of Indonesian lignite. Physicochemical properties including total organic carbon (TOC), chemical oxygen demand (COD), organic functional groups, inorganic anions, inorganic cations, surface tension, pH, and electrical conductivity (EC) of the removed water were analysed. Results showed...
Due to the high moisture content (25–65%) dewatering is essential for the clean and efficient utilization of lignite as fuel or feedstock for chemical industry. In order to quantitatively evaluate the desorption energy of contained water content, a prediction model was proposed in this paper based on Lennard-Jones 10-4-3 solid–fluid potential equation and Clausius–Clapeyron principle using lignite...
Indonesian lignite was continuously modified in a tunnel-type microwave oven to improve its slurribility. The maximum solid concentration of coal–water slurry (CWS) prepared from modified lignite increased from 41.6wt.% to 54.0wt.% with an enhanced rheological behaviour. The contact angle, oxygen functional groups, molar ratio of methylene to methyl, paramagnetic centres of modified lignite were analysed...
Changes in the structural features of XiMeng (XM) lignite during hydrothermal dewatering (HTD) were investigated by solid-state nuclear magnetic resonance (NMR) spectroscopy. Gas-, solid-, and liquid-phase products obtained after HTD were also analyzed, and the occurrence of carbon and its migration mechanism during HTD were determined. The equilibrium moisture of XM lignite decreased from 21.44%...
The pore structure and fractal analysis of Ximeng lignite (XL) under microwave irradiation were investigated. Effects of drying temperature, microwave irradiation time, and microwave power level were studied. The pore structures of XL were obtained by N2 adsorption/desorption at 77K. Two fractal dimensions, D1 and D2, at relative pressures of 0–0.5 and 0.5–1, respectively, were calculated with the...
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