کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
209201 461660 2016 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Microwave drying performance of single-particle coal slime and energy consumption analyses
ترجمه فارسی عنوان
عملکرد خشک کردن مایکروویو از لجن زغال سنگ تک ذرات و تجزیه و تحلیل مصرف انرژی
کلمات کلیدی
لجن زغال سنگ، خشک کردن مایکروویو، مصرف انرژی، تجزیه و تحلیل سینتیک
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


• The drying performance of single-particle coal slime was studied using MTGA.
• The internal temperatures of coal slime under microwave radiation were measured.
• The microwave drying process of coal slime includes three distinct stages.
• The energy consumption and the instantaneous energy efficiency were analyzed.
• The effective diffusivity of moisture and activation energy was determined.

The drying of coal slime with high moisture is an essential step for the majority of its industrial applications. Microwave radiation could serve as an alternative way of efficient drying, owing to its unique heating properties. In this study, the weight loss and temperature distribution of spherical single-particle coal slime were measured by using a microwave thermogravimetric analysis (MTGA) device, which was designed for this study, equipped with an accurate electronic balance and fiber optic thermometers. In addition, the effects of microwave power (320, 480, 640, and 800 W) and particle size (30, 40, 50, and 60 mm) on the drying performances were studied. The microwave drying process of coal slime comprises three stages: an incubation period, whereby a rapid increase in temperature occurs, a constant-rate drying stage, during which a rapid moisture loss occurs at about 100 °C, and a falling-rate drying period, during which a significant increase in temperature is observed again. Weight loss rates increased with increasing power output of the microwave oven or with decreasing particle size. The energy consumption and the energy efficiency during the drying process were also analyzed. The results demonstrated that the specific energy consumption declined with the overall increase in power and particle size, while the efficiency of microwave output increased with increasing particle size. Furthermore, the diffusion kinetics of moisture in coal slime were examined. The effective diffusion coefficients of moisture increased with both increasing particle size and microwave power, whereas the activation energy of the diffusion process decreased with increasing particle size.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fuel Processing Technology - Volume 143, March 2016, Pages 69–78
نویسندگان
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