کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7159457 1462806 2018 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Improved numerical approaches to predict hydrodynamics in a pilot-scale bubbling fluidized bed biomass reactor: A numerical study with experimental validation
ترجمه فارسی عنوان
بهبود رویکردهای عددی برای پیش بینی هیدرودینامیک در یک رآکتور زیست توده سوسپانسیون فاضلاب فاضلاب: یک مطالعه عددی با اعتبار سنجی آزمایشی
کلمات کلیدی
هیدرودینامیک، انتقال گرما، شاخص مخلوط کردن و جداسازی، گسیفاینده ی کوره ذوب شده در مقیاس خلبان، کاربر تعریف شده توابع، گازسیون زیست توده،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی (عمومی)
چکیده انگلیسی
A computational 2-D Eulerian-Eulerian approach was developed to simulate the hydrodynamics and heat transfer of a biomass gasification process in a pilot-scale bubbling fluidized bed reactor. The mathematical model was validated under experimental results collected from fluidization curves gathered at different temperatures in a pilot-scale reactor (75 kWth). Own user defined functions (UDFs) were developed in C programming and included to improve drag and heat transfer phenomena, as well to minimize deviations between experimental and numerical data found in previous works. Mesh selection was achieved by comparing solid fraction and pressure drop contours with grids comprised of different number of cells. A comparative study for particle diameter and inlet gas velocity was conducted for three different biomass feedstocks' and their impact in the mixing and segregation index was studied. Mixing and segregation index were measured by implementing the standard deviation concept. Results indicated that UDFs significantly improved the mathematical model predictions on the reactor's fluidization curves. Biomass and sand particles size and density showed direct influence on the solids distribution along the bed height. Smaller biomass particles revealed faster heat conduction and improved mixing properties.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Energy Conversion and Management - Volume 156, 15 January 2018, Pages 53-67
نویسندگان
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