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HulunBuir lignite pyrolysis at low temperatures with different coal particle sizes, and different heating modes were studied on a fixed-bed reactor in order to investigate the oxygen evolution characteristics. The results show that pyrolysis temperature heavily influences the oxygen evolution. Almost 70.69wt% of oxygen in lignite transferred into volatile products at 700°C. With an increase of temperature,...
The grinding characteristics of untreated and microwave-treated Ximeng lignites (XLs) were investigated, and the effects of microwave irradiation time, particle size range, and initial moisture were studied. The mass fraction and particle size distribution of the fine ground product with <0.154mm particle size range of untreated and microwave-treated XLs were obtained. According to the analysis...
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...
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...
To utilize the coal direct liquefaction residue (DLR) and improve the tar yield and quality, experimental studies on co-pyrolysis of lignite and DLR were conducted with a fixed-bed reactor under atmospheric pressure in high purity nitrogen. In-situ micro-Raman experiments, Soxhlet extraction, scanning electron microscope, and X-ray energy spectra analysis were also performed to explore the interaction...
The thin-layer drying characteristics of Ximeng lignite (XL) were investigated under microwave irradiation, and mathematical modeling using thin-layer drying models from literature was performed. The effects of coal particle size and microwave power level on drying characteristics were studied. The drying rate increased and drying time decreased with increasing particle size or microwave power level...
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