کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7606801 1492964 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Heat transfer-limited flash pyrolysis of woody biomass: Overall reaction rate and time analysis using an integral model with experimental support
ترجمه فارسی عنوان
پیرولیز فلش محدود فیزیکی زیست توده چوب: سرعت واکنش و تجزیه و تحلیل زمان با استفاده از یک مدل انتگرال با حمایت تجربی
کلمات کلیدی
فریزر فلش، درجه حرارت بالا، انتقال گرما محدود است مدل یکپارچه، سینتیک نرخ بی نهایت،
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی
High temperature flash pyrolysis takes place on the second to sub-second time-scale depending on particle size. This particle size dependency conveys an overall heat transfer-limited reaction process as shown by characteristic time analysis. For processes that employ rapid pyrolysis, such as gasification, global or semi-global reaction models are used and are confounded with competing physical phenomena. A heat transfer-limited integral model was used to resolve characteristic pyrolysis times and rates fitted to experimental results from a drop-tube reactor and woody biomass at temperatures in the range 1773-2273 K. Two model derivations were compared and little difference was observed. Particle size, biomass density, reactor wall temperature, and heat of reaction were the most significant parameters from a sensitivity analysis. Experimentally, it was found that increasing initial particle temperature above the boiling point of water changed the thermophysical properties of the reacting particle such that the reaction time was accelerated up to 30%, affecting the calculated heat of reaction and thermal diffusivity. Halving the particle size resulted in up to 75% decreased pyrolysis reaction time, and increasing reactor wall temperature from 1773 K to 2273 K resulted in up to 50% faster reaction times.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Analytical and Applied Pyrolysis - Volume 113, May 2015, Pages 474-482
نویسندگان
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