کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6764593 | 1431581 | 2018 | 48 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Study of mixing systems and geometric configurations for anaerobic digesters using CFD analysis
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
Anaerobic digester is the most widespread technology for the treatment of biomass to produce biogas. Mixing is an important parameter to have a highly efficient anaerobic digestion. Computational fluid dynamics can provide detailed modeling about the hydrodynamics and mixing of an anaerobic digestion. In this research, a computational fluid dynamics analysis is developed to establish the better geometric configuration and mixing system for an anaerobic digester producing biogas. Three different scenarios as continuous stirred tank reactors are considered. External pumps for liquor recirculation are used as mixing system. Flow patterns, media, variance, standard deviation of average velocity and velocity gradient are used as parameters to evaluate mixing. Simulation results suggest that the innovative configuration in which the fluid enters tangent to the lateral surface of the anaerobic digester is the best solution. Media, variance, standard deviation of average velocity and velocity gradient are equal to 0.01522â¯m/s, 0.00006â¯m/s, 0.00758â¯m/s, 75 sâ1 respectively. These ensure to have dead zones equal to the 0.2% of total volume. Shear rate at the bottom is 1.1â10â3 sâ1 in all plane while the power of recirculating pump is 1.9 kw/m3. Computational fluid dynamics is then a promising technology for analyzing mixing.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Renewable Energy - Volume 123, August 2018, Pages 578-589
Journal: Renewable Energy - Volume 123, August 2018, Pages 578-589
نویسندگان
Grazia Leonzio,