بهینه سازی فرآیند تولید بریکت از ترکیب باگاس و پوست گردو با استفاده از روش سطح پاسخ و ارزش حرارتی آن

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه فنی کشاورزی،دانشکدگان ابوریحان، دانشگاه تهران، پاکدشت، تهران، ایران

2 گروه فنی کشاورزی، دانشکدگان ابوریحان، دانشگاه تهران، پاکدشت، تهران، ایران

چکیده

متراکم کردن مواد زیست‌توده حجیم مانند بریکت‌کردن، موجب بهبود ویژگی‌های مدیریتی مواد مانند چگالی برای حمل و نقل، انبارداری و غیره می‌شود. این تحقیق به منظور تعیین شرایط بهینۀ فرآیند تولید بریکت از ترکیب باگاس و پوست گردو با استفاده از دستگاه پرس هیدرولیکی به روش سطح پاسخ انجام گرفت. اثر متغیرهای مستقل شامل اندازه ذرات باگاس، دمای فرآیند، رطوبت ذرات باگاس و درصد نسبی ترکیب پوست گردو به باگاس، همگی در سه سطح بر متغیرهای پاسخ چگالی و مقاومت کششی مورد ارزیابی قرار گرفت. مقدار ارزش حرارتی بریکت از طریق معادلات تجربی خطی و غیرخطی صحه‌گذاری شده ارزش حرارت بالا با استفاده از نتایج آنالیز تقریبی شامل مواد فرار، کربن ثابت و محتوای خاکستر تعیین شد. نتایج نشان داد که با کاهش رطوبت ذرات باگاس چگالی و مقاومت کششی بریکت افزایش می‌یابد. افزودن پوست گردو در بریکت تولیدشده با اندازۀ ذرات ریز باگاس موجب کاهش مقاومت کششی گردید. تولید بریکت سبب کاهش معنی‌دار درصد مواد فرار و افزایش درصد کربن تثبیت شد. افزایش ارزش حرارتی نمونۀ مادۀ اولیه نسبت به بریکت تولیدشده از 16 به 22 مگاژول بر کیلوگرم نشان‌دهندۀ اثرات مثبت کاربرد فرآیند بریکت‌سازی است. شرایط بهینۀ تولید بریکت در نسبت ترکیب پوست گردو به باگاس 5 درصد، اندازۀ ذرات باگاس کوچک‌تر از 18/1 میلی‌متر، رطوبت باگاس 7 درصد بر پایۀ تر و دمای قالب 360 درجه سلسیوس تعیین شد. مقدار بهینۀ پاسخ‌های چگالی و مقاومت کششی به‌ترتیب 847/867 کیلوگرم بر متر مکعب و 356/1 مگاپاسکال بود. در این شرایط ارزش حرارتی 22 مگاژول بر کیلوگرم به‌دست آمد.

کلیدواژه‌ها


عنوان مقاله [English]

Optimization of the briquette production process from the composition of bagasse and walnut shell using the response surface methodology (RSM) and its calorific value

نویسندگان [English]

  • Hussain Shafaie 1
  • Ali mashaallah Kermani 2
  • Mohammad Hossein Kianmehr 2
  • Seyed Reza Hassanbeygi 2
1 Department of Agrotechnology Engineering,, College of Abouraihan, University of Tehran, Pakdasht, Tehran, IR Iran
2 Department of Agrotechnology Engineering,, College of Abouraihan, University of Tehran, Pakdasht, Tehran, IR Iran
چکیده [English]

Densification of biomass materials such as briquette improves the management properties of materials for transportation, storage, and so on. This study aimed to determine the optimal conditions of the briquette production process using a hydraulic press from the combination of bagasse and walnut shell using response surface methodology. The effects of independent variables including bagasse particle size (PS), process temperature (PT), bagasse moisture content (MC), and the composition ratio percentage of the walnut shell to bagasse (CR) were evaluated at three levels on the response variables of the density and tensile strength. The calorific value of the briquette was determined through validated linear and nonlinear equations of the high heat value using the proximate analysis of volatiles, fixed carbon, and ash. The results showed that by decreasing the moisture content of bagasse particles, the density and tensile strength of the briquette increased. Adding walnut shell particles to the briquette produced with the size of fine particles reduces tensile strength. The briquette production significantly reduced the percentage of volatile materials relative to their biomass and increased the percentage of fixed carbon. The calorific value of the raw material sample relative to the briquette produced increased from 16 to 22 MJ/kg. The optimal values of the density and tensile strength of briquettes were equal to 867.847 kg/m3 and 1.356 MPa, respectively at the CR of 5%, PS less than 1.18 mm, MC content of 7%, and PT of 360 °C. At this condition, the calorific value of 22 MJ/kg was obtained.

کلیدواژه‌ها [English]

  • Bagasse
  • Calorific value
  • Fuel briquette
  • Response Surface methodology
  • Tensile strength
  • Walnut shell
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