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首页> 外文期刊>ACS Omega >Theoretical Analysis and Optimization of Fine Lignite Drying and Separation with a Pulsed Fluidized Bed
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Theoretical Analysis and Optimization of Fine Lignite Drying and Separation with a Pulsed Fluidized Bed

机译：细褐煤干燥的理论分析与优化脉冲流化床分离

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We established a pulsed fluidized bed system to dry and concurrently separate fine lignite (?6 + 3 and ?3 + 1 mm lignite). The kinetics and evaporation of lignite moisture were investigated in the pulsed air flow. The variation in the evaporation rate was studied theoretically with respect to temperature, velocity of the pulsed air flow, and pulsed frequency. The rubbing effect between the air and lignite particle probably dominates the evaporation of water. The influence of temperature on the evaporation rate is more significant than that of air velocity by merely considering the effect of air entrainment of the evaporated moisture. Four operational parameters, including inlet temperature, air velocity, pulsating frequency, and bed height, were investigated and optimized through a response surface method to study the interactions between factors and determine the optimal separation conditions. Results indicate that the maximum standard deviation of the ash content of 23.74% was recorded under the optimal condition of the inlet temperature (80 °C), pulsating frequency (3.93 Hz), air velocity (1.09 m/s), and bed height (120 mm) for ?6 + 3 mm lignite, and the maximum standard deviation of 24.99% was recorded for ?3 + 1 mm lignite under the condition of the inlet temperature (100 °C), pulsating frequency (3.49 Hz), air velocity (0.55 m/s), and bed height (80 mm). The probable error values of separations of ?6 + 3 mm lignite and ?3 + 1 mm lignite with the pulsed fluidized bed were 0.12–0.16 and 0.10–0.16 g/cm~(3), respectively, which demonstrates that efficient drying and simultaneous separation of lignite can be achieved with the pulsed fluidized bed.
机译：我们建立了一种脉冲流化床系统，以干燥和同时分离细褐煤（α6+ 3和α3+ 1mm褐煤）。在脉冲空气流动中研究了褐煤水分的动力学和蒸发。理论上，脉冲空气流的温度，脉冲速度和脉冲频率理论地研究蒸发速率的变化。空气和褐煤粒子之间的摩擦效应可能占据水的蒸发。通过仅考虑空气夹带的蒸发水分的影响，温度对蒸发速率的影响比空气速度更大。通过响应表面方法研究并优化了四种操作参数，包括入口温度，空气速度，脉动频率和床高度，以研究因素之间的相互作用并确定最佳分离条件。结果表明，在入口温度（80°C），脉动频率（3.93Hz），空气速度（1.09m / s）和床高度（ 120 mm）对于λ6+ 3mm褐煤，在入口温度（100°C）的条件下，在入口温度（100°C），脉动频率（3.49Hz），空气速度下，记录24.99％的最大标准偏差。 （0.55米/秒）和床高（80毫米）。具有脉冲流化床的α6+ 3mm褐煤的分离的可能误差值分别为0.12-0.16和0.10-0.16g / cm〜（3），表明有效的干燥和同时通过脉冲流化床可以实现褐煤的分离。

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