Effect of operating conditions on drying of Chinese lignite in a vibration fluidized bed

Drying kinetics of coarse lignite particles in a fixed bed

“…Thin-layer drying models have been adopted to coal drying in a few studies [21][22][23][24]. Pickles et al investigated microwave drying of a lowrank sub-bituminous coal [21].…”

Comparative studies on the effect of mineral matter on physico-chemical properties, inherent moisture and drying kinetics of Chinese lignite

“…Numerous coal cleaning technologies associated to de-watering [6][7][8][9][10] and de-ashing [11][12][13][14] processes have been proposed to sustainably utilize these lignites. However, most of them were not yet widely practiced by the power industry considering the high consumption of energy required during cleaning processes.…”

“…Tahmasebi et al [29] also gained the drying kinetics of a Chinese low rank coal in the superheated steam fluidized-bed and microwave. Zhao et al [6] further obtained the drying kinetics of a Chinese low rank coal in a vibration-fluidized bed. Many researchers have revealed that thin-layer empirical equations are often used for description of drying kinetics of low-ash lignite, but little research is available to date on the potential impact of high-ash lignite.…”

Effects of coal drying on the pyrolysis and in-situ gasification characteristics of lignite coals

“…Nevertheless, lignite coals were usually dried in an oven at 105°C under nitrogen before the thermal reaction experiments at high temperatures in most of these researches [3][4][5][6][7][8], and the effects of water in coals on the reaction characteristics were not considered. As a young coal, lignite coal usually contains high volatiles (30-50 wt.%, dry basis) and moisture contents (20-55 wt.%, as received basis), [9][10][11][12] and the moisture contents in some lignite coals can even reach $70 wt.% (as received basis) [13]. The high moisture content in lignite coal may cause unfavorable limitations in improving thermal efficiency and a low energy output relative to other coals [12,14].…”