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مدلسازی و بهینهسازی انرژی مصرفی ویژه و انتشار گازهای گلخانهای طی خشککردن توت سیاه ارگانیک با پیش تیمارهای مختلف به روش سطح پاسخ | ||
| مهندسی بیوسیستم ایران | ||
| مقاله 11، دوره 51، شماره 2، تیر 1399، صفحه 351-369 اصل مقاله (3.63 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijbse.2020.289264.665224 | ||
| نویسندگان | ||
| ابراهیم تقی نژاد* 1؛ محمد کاوه2 | ||
| 1گروه مهندسی فناوری کشاورزی، دانشکده کشاورزی و منابع طبیعی مغان، دانشگاه محقق اردبیلی، اردبیل | ||
| 2گروه مهندسی بیوسیستم، دانشکده کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی، اردبیل | ||
| چکیده | ||
| بیشترین سهم گازهای گلخانهای در جهان مربوط به مصرف سوخت‌های فسیلی در نیروگاه‌ها به‌منظور تولید برق می‌باشد. تولید و انتشار گازهای گلخانهای برای فرایند خشککردن که دارای مصرف انرژی بالایی است، اهمیت بیشتری دارد. در این تحقیق، مدلسازی و بهینهسازی مقادیر انرژی مصرفی ویژه و انتشار گازهای گلخانهای شامل CO2 و NOX طی فرایند خشککردن توت سیاه تحت خشک‌کن ترکیبی هوای گرم – مادون‌قرمز (در سه سطح دمای هوای ورودی 50، 60 و °C 70) با پیش تیمارهای مختلف شامل مایکروویو (90، 180 و w 360)، بلانچینگ (70، 80 و C°90) و فراصوت (15، 30 وmin 45) توسط روش سطح پاسخ مورد ارزیابی قرار گرفت. انرژی خشک‌کن از توربین‌های مختلف بخار، توربین گاز و نیروگاههای ترکیبی با سوخت‌های گاز طبیعی، نفت سنگین و نفت گاز تأمین می‌گردد. نتایج نشان داد که با افزایش توان مایکروویو و زمان فراصوت مقدار انرژی مصرفی ویژه طی معادله درجه دوم از 55/185تا kWh/kg53/55، کاهش یافت. همچنین این مقدار با افزایش دمای بلانچینگ طی معادله خطی روند کاهشی (از 08/208 تا kWh/kg56/88) داشت. مقدار انتشار تمامی گازهای گلخانهای با افزایش توان مایکروویو، زمان فراصوت و دمای هوای گرم برای تمامی توربین‌ها با سوخت‌های مختلف طی معادله درجه دوم روند کاهشی (از 67/194460 تا g 98/24987 برای CO2 و از 36/1074 تا g 06/106 برای NOx) نشان داد. درحالی‌که این مقادیر با افزایش دمای بلانچینگ، به‌طور خطی، کاهش (از 85/218063 تا g 54/39985 برای CO2 و از 76/1204 تا g 72/169 برای NOx) یافت. بر اساس مدلسازی به روش سطح پاسخ، شرایط بهینه جهت کمترین انرژی مصرفی ویژه، در توان مایکروویو W 7/349 و دمای هوای ورودی oC 80/69 برای پیش تیمار مایکروویو، زمان فراصوت min 45 و دمای هوای ورودی oC 70 برای پیش تیمار فراصوت، دمای بلانچینگ oC 90 و دمای هوای ورودی oC 70 برای پیشتیمار بلانچینگ با میانگین مطلوبیت 8/99% تعیین گردید. | ||
| کلیدواژه‌ها | ||
| خشک کن ترکیبی؛ سطح پاسخ؛ گازهای گلخانه ای؛ مدلسازی؛ میوه توت | ||
| عنوان مقاله [English] | ||
| Modeling and Optimization of Specific Energy Consumption and Green House Gas Emissions During Drying of Organic Blackberry with Different Pretreatments by Response Surface Methodology | ||
| نویسندگان [English] | ||
| Ebrahim Taghinezhad1؛ Mohammad Kaveh2 | ||
| 1Moghan College of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran | ||
| 2Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran | ||
| چکیده [English] | ||
| The largest share of greenhouse gases in the world is related to the use of fossil fuels in power plants for electricity generate. Production and emissions of greenhouse gas are more important for the drying process that has high specific energy consumption (SEC). In this study, modeling and optimization of SEC and greenhouse gas emissions including CO2 and NOx during the process of blackberry drying under infrared-hot air combined dryer (at three inlet air temperature levels 50, 60 and 70 ° C) with different pretreatments including of microwave (90, 180 and 360 w), blanching (70, 80 and 90 ° C) and ultrasond (15, 30 and 45 min) were evaluated by response surface methodology. The drying energy was provided by various steam turbines, gas turbines and combined plants using natural gas, heavy oil and gas oil as fuel. The results showed that by increasing the microwave power and ultrosond time decreased quadraticly the amount of SEC (from 185.55 to 55.53 kWh/kg). However, this value decreased linearly (from 208.08 to 88.56 kWh/kg) with increasing blanching temperature. Emissions amount for all greenhouse gas decreased quadraticly (from 194460.67 to 24987.97g for CO2 and from 1074.36 to 106.06 g for NOx) with increasing microwave power, ultrosound time and hot air tepmerature for all turbines with different fuels. However, this amount decreased linearly with increasing blanching temperature (from 218063.85 to 39985.54g for CO2 and from 1204.76 to 169.72 g for NOx). Based on modeling using RSM, optimum conditions for the minimum SEC were determined to be microwave power of 349.7 W and inlet air temperature of 69.8 oC for microwave pretreatment, ultrasound time of 45 min and inlet air temperature of 70 oC for ultrasound pretreatment, blanching temperature of 90 oC and inlet air temperature of 70 oC for blanching pretreatment with disierability mean of 99.8%. | ||
| کلیدواژه‌ها [English] | ||
| Combined dryer, Response surface, Green house gas, Modelling, Blackberry fruit | ||
| مراجع | ||
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