کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7159530 | 1462807 | 2018 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of operating parameters on performance of a downdraft gasifier in steady and transient state
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A steady analysis reveals that higher equivalence ratio (ER), lower steam to biomass ratio (S/B) result in a higher reaction temperature, which promotes the yield of H2 and CO and the char conversion into syngas in this work. For S/Bâ¯=â¯0 and mass flow rate of biomass equal to 20.9â¯kgâ¯hâ1, char conversion rate increases from 76% to 100% due to increasing of ER from 0.39 to 0.43. For ERâ¯=â¯0.43 and mass flow rate of biomass equal to 20.9â¯kgâ¯hâ1, char conversion rate decreases from 84% to 24% due to increasing of S/B from 1 to 4.The molar fraction of gas composition almost remains stable for mass flow rate of biomass in the range of 18-22â¯kgâ¯hâ1.The large mass flow rate of biomass is obviously unfavorable for char conversion due to low temperature. For steam flow rate equal to 0.247â¯molâ¯sâ1 and air flow rate equal to 0.5326â¯molâ¯sâ1, the char conversion rate declines from 100% to 71% due to mass flow rate of biomass increasing from 19 to 22â¯kgâ¯hâ1.The higher flow rate of H2O relies on less yield of H2 if ER is less or S/B is higher corresponding to more steam inducted into gasifier. Transient analysis shows that flow rate of H2 goes down then up with increasing of ER due to competition between oxidation and reduction reactions. As S/B changing alone, the yield of H2O is absolutely dominated by inlet steam whether flow rate of H2 increases or not.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Energy Conversion and Management - Volume 155, 1 January 2018, Pages 138-146
Journal: Energy Conversion and Management - Volume 155, 1 January 2018, Pages 138-146
نویسندگان
Junxi Jia, Lijun Xu, Abuliti Abudula, Baozhi Sun,