کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1731435 1521453 2016 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Extension of apparent devolatilization kinetics from thermally thin to thermally thick particles in zero dimensions for woody biomass
ترجمه فارسی عنوان
گسترش سینتیک ظاهری تحریک پذیری از ذرات گرمای نازک تا ذرات گرمایی در ابعاد صفر برای زیست توده چوبی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی (عمومی)
چکیده انگلیسی


• Non-isothermal modeling correcting for internal heat transport limitations.
• Large particle heating rate interval (30–105 K/s).
• Large particle size interval (0.063–10.9 mm).
• Direct comparison to existing non-isothermal approach in ANSYS FLUENT.
• Easy implementation to ANSYS FLUENT without further stressing the computational requirements.

This work aims to provide an accurate and simple model, predicting the time dependent devolatilization of woody biomass at conditions (Tgas < 2000 K) and particle sizes (<2 mm) relevant to suspension fired boilers. The zero dimensional model is developed from reference calculations with a one-dimensional heat transport model coupled with a drying and a devolatilization model. The model output has been used to generate pyrolysis kinetics corrected for non-isothermal effects, i.e. intraparticle heat transport limitations. Analysis of the modeling results indicate that heat transport corrections of even small particles are necessary. The current work divides a given particle size distribution into suitable size categories based on their internal heat transport properties. The devolatilization is described by size category specific rate constants based on a single first order reaction mechanism. This approach allows for significantly more accurate devolatilization predictions of any particle size distribution to be described by simple kinetic mechanisms and isothermal particle heat balances. Such an approach is easily implemented into most commercial CFD (computational fluid dynamics) codes without adding any additional strain to the computational requirements.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Energy - Volume 95, 15 January 2016, Pages 279–290
نویسندگان
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