کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8071040 | 1521391 | 2018 | 20 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Optimum mixing rate in biogas reactors: Energy balance calculations and computational fluid dynamics simulation
ترجمه فارسی عنوان
میزان مخلوط کردن بهینه در راکتورهای بیوگاز: محاسبات تعادل انرژی و شبیه سازی دینامیکی سیالات محاسباتی
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کلمات کلیدی
هضم، بهره وری انرژی، تکان دهنده مکانیکی، انرژی تجدید پذیر، آشفتگی،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی (عمومی)
چکیده انگلیسی
Limited renewable energy resources, population overgrowth, development of industries and environmental pollution have made countries tend towards the use of renewable energy resources, e.g. solar, wind and biogas energies. In this respect, this study attempts to determine the best rate of mechanical stirrers for biogas reactors through energy balance calculations and fluid dynamics simulations. The conducted experiments utilized a semi-industrial scale bioreactor (1.2â¯m3 volume) containing a 45° six-bladed turbine stirrer while the simulations evaluated the effect of 0, 40, 80 and 120 rounds per minute (rpm) stirrer rates. The stirrer rate of 80â¯rpm provided appropriate mixing in the center and walls of the reactor, reduced dead spaces and enhanced mass and heat transfer in the reactor. In other words, the experiments on biogas generation from cow manure at different stirrer rates identified 80â¯rpm as the rate that can present the optimum performance. Also, energy balance and evaluation of the energy measures distinguished the stirrer rates of 40 and 80â¯rpm for achieving the highest energy efficiency and net energy gain. However, these energy related values were found to decrease at 120â¯rpm rate, noticeably. The highest obtained energy efficiency and net energy gain values, i.e. 1.182â¯MJ and 43.382â¯MJ respectively, were obtained at 80â¯rpm. Therefore, this stirrer rate is suggested to be applied under similar conditions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Energy - Volume 159, 15 September 2018, Pages 54-60
Journal: Energy - Volume 159, 15 September 2018, Pages 54-60
نویسندگان
Rashed Mohammadrezaei, Samira Zareei, Nasser Behroozi- Khazaei,