【摘要】 为探究褐煤热风-红外对流辐射干燥的水分迁移规律，以高西沟褐煤为研究对象，采用单一热风、单一红外与热风-红外串联干燥方式进行对比试验，分析了不同温度、粒度对褐煤单一热风与单一红外干燥特性影响以及不同转换时间对褐煤热风-红外串联干燥特性影响，并通过干燥动力学模型拟合，选择适用于热风段与红外段的干燥动力学模型。结果表明：单一热风干燥以降速期为主，单一红外干燥存在明显恒速期，而热风-红外串联干燥无恒速期，且转换时间越早干燥效率越高，转换时间为5 min时对应最大干燥速率为0.082 9 g·g^-1·min^-1;热风段和红外段的有效水分扩散系数分别为5.90×10^-8 m²/s和1.17×10^-7 m²/s,活化能分别为29.22 kJ/mol和1.439 W/g; Logarithmic模型和Weibull模型分别适用于热风段和红外段的水分比预测，R²分别为0.999 6和0.993 5。研究为褐煤干燥工艺优化提供了理论依据，对褐煤资源高效利用具有重要的科学价值和实践指导意义。更多还原

【Abstract】 To investigate moisture migration law during hot air-infrared tandem drying of lignite, Gaoxigou lignite was selected as the research subject, comparative experiments were conducted using single hot air drying, single infrared drying, and hot air-infrared tandem drying.The effects of different temperatures and particle sizes on the drying characteristics of both single hot air drying and single infrared drying of lignite were analyzed, and the effects of different conversion times on the drying characteristics of hot air-infrared tandem drying of lignite were also analyzed.Through fitting with drying kinetics models, suitable models for the hot air stage and infrared stage were selected respectively.The results indicate that: Single hot air drying predominantly occurs during the deceleration period, and single infrared drying exhibits a distinct constant rate period, while hot air-infrared tandem drying does not feature a constant rate period, and the earlier the conversion time, the higher the drying efficiency.The maximum drying rate of 0.082 9 g·g^-1·min^-1 is achieved at a transition time of 5 minutes.The effective moisture diffusion coefficients for the hot air section and the infrared section are determined to be 5.90×10^-8 m²/s and 1.17×10^-7 m²/s, respectively, with activation energies of 29.22 kJ/mol and 1.439 W/g, respectively.Logarithmic model and the Weibull model are suitable for predicting the moisture ratio in the hot air section and the infrared section, respectively, with R² values of 0.999 6 and 0.993 5.This study provides a theoretical basis for optimizing lignite drying processes and holds significant scientific value and practical guidance for the efficient utilization of lignite resources.更多还原