Biomass gasification in a circulating fluidized bed
Biomass gasification in a circulating fluidized bed
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DOI：
10.1016/s0961-9534(03)00084-9
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发表时间：
2004-01-01
影响因子：
6
通讯作者：
Kim, JR
中科院分区：
文献类型：
--
作者：
Li, XT;Grace, JR;Kim, JR
本文介绍了在中试规模（6.5米高× 0.1米）的生物质气化试验的结果。直径）的空气吹循环流化床气化炉，并与模型预测进行比较。操作温度保持在700- 850 ℃的范围内，而木屑进料速率在16 - 45 kg/h之间变化。温度、空气比、悬浮密度、飞灰回注和蒸汽注入对产物气体的组成和热值有影响。焦油产率从生物质气化呈指数下降，增加操作温度的范围内研究。建立了基于吉布斯自由能直接最小化的非化学计量平衡模型来预测气化炉的性能。实验证据表明，试点气化炉偏离化学平衡，由于动力学的限制。一个现象学模型改编自纯平衡模型，结合实验结果未转化的碳和甲烷占非平衡因素，预测产品气体成分，热值和冷气体效率与实验数据吻合良好。(C)2003 Elsevier Ltd.保留所有权利。
This paper presents the results from biomass gasification tests in a pilot-scale (6.5-m tall x 0.1-m. diameter) air-blown circulating fluidized bed gasifier, and compares them with model predictions. The operating temperature was maintained in the range 700-850degreesC, while the sawdust feed rate varied from 16 to 45 kg/h. Temperature, air ratio, suspension density, fly ash re-injection and steam injection were found to influence the composition and heating value of the product gas. Tar yield from the biomass gasification decreased exponentially with increasing operating temperature for the range studied. A non-stoichiometric equilibrium model based on direct minimization of Gibbs free energy was developed to predict the performance of the gasifier. Experimental evidence indicated that the pilot gasifier deviated from chemical equilibrium due to kinetic limitations. A phenomenological model adapted from the pure equilibrium model, incorporating experimental results regarding unconverted carbon and methane to account for non-equilibrium factors, predicts product gas compositions, heating value and cold gas efficiency in good agreement with the experimental data. (C) 2003 Elsevier Ltd. All rights reserved.