Theoretical and Experimental Study of Potato Shoot Gasification in Fluidized- and Fixed-Bed Gasifier
محورهای موضوعی : Farm Structures
مجتبی جاویدی قراچه
1
(
دانشجوی دکتری، گروه مهندسی بیوسیستم، دانشگاه فردوسی مشهد، مشهد، ایران
)
مهدی خجسته پور
2
(
دانشیار، گروه مهندسی بیوسیستم، دانشگاه فردوسی مشهد، مشهد، ایران
)
محمدعلی ابراهیمی نیک
3
(
استادیار، گروه مهندسی بیوسیستم، دانشگاه فردوسی مشهد، مشهد، ایران
)
ون ازلینا ون اب کریم قانی
4
(
دانشیار گروه مهندسی شیمی، دانشگاه پوترا مالزی، مالزی
)
کلید واژه: Modeling, updraft, fixed-bed gasifier, fluidized-bed gasifier,
چکیده مقاله :
A bench-scale updraft gasifier was used as a fluidized- and fixed-bed gasification unit in three modes (fluidized-bed at equivalence ratios (ER) =0.2 and 0.25, and a mode in fixed-bed). The experiments were done in five different temperatures (650, 700, 750, 800 and 850oC). To obtain the required data to develop a thermodynamic equilibrium model, the proximate and ultimate analysis were carried out on potato shoot as feedstock. Since the developed model is a temperature-based model, it gives different outcomes in different temperatures. The model gave a completely exact result to predict CH4 in fluidized-bed at ER=0.25. The average error for the difference between each produced gas in experiments and the model showed the best result of the model for CO with the error of just 0.7%. Regarding each experiment data difference with the model data, the model was more accurate to be used in fluidized-bed, especially at ER=0.25 than the other two modes. Moreover, the best performance of the model was obtained for CO, N2 and CO2, according to the average errors. Since the maximum amount of high heating value (HHV) and carbon conversion efficiency (CCE) was observed at higher temperatures, it can be contended that the model has better performance at higher temperatures.
دستگاه گازی‌ساز بالاسو در مقیاس آزمایشگاهی به دو صورت بستر سیال و ثابت در سه حالت (بستر سیال با دو نسبت تعادل 2/0 و 25/0 و یک حالت با بستر ثابت) برای این تحقیق به کار گرفته شد. آزمایش در پنج دمای راکتور مختلف (650، 700، 750، 800 و °C850) انجام شد. برای به دست آوردن داده‌های مورد نیاز برای مدل تعادل ترمودینامیکی تحلیل تخمینی و نهایی روی اندام‌های هوایی سیب‌زمینی به عنوان خوراک دستگاه صورت گرفت. این مدل بر پایه دما است و نتایج متفاوتی برای دماهای مختلف ارائه می‌دهد. مدل نتیجه کاملاً دقیقی برای پیش‌بینی مقدار متان در نسبت تعادلی 25/0 ارائه داد. با در نظر گرفتن متوسط مقدار هر مؤلفه گازی در گاز خروجی کمترین خطا برای پیش‌بینی CO با خطای 7/0 درصد بود. با در نظر گرفتن نتایج آزمایشگاهی مدل نتایج بهتری برای پیش‌بینی مؤلفه‌های گازی در بستر سیال به خصوص در نسبت تعادلی 25/0 ارائه کرد. با توجه به خطای متوسط بهترین نتایج برای CO، N2 و CO2 به دست آمد. با افزایش دما مقادیر ارزش حرارتی حداکثر و راندمان تبدیل کربن افزایش یافت.
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