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Defluidization and agglomeration of a fluidized bed reactor during Cynara cardunculus L. gasification using sepiolite as a bed material

机译:使用海泡石作为床料在Cynara cardunculus L.气化过程中流化床反应器的流体化和团聚

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摘要

This work studies the defluidization time and the agglomerate generation in a bubbling fluidized bed (BFB) reactor during Cynara cardunculus L. gasification using, separately, two different bed materials, silica sand and sepiolite 〖(MG〗_8 〖Si〗_12 O_30 (OH)_4 〖(OH〗_2)(_4^)8 H_2). The high adsorption capacity and the elemental composition of the sepiolite make it suitable as an alternative bed material in order to reduce agglomeration. Experiments were performed on a stainless steel lab-scale BFB reactor operating with air as a gasifying agent at different air excess ratios (u/umf). A quartz reactor was alternatively used for the visualization of bed material and biomass during gasification, allowing one to observe the agglomerate formation process. Pressure signals were analyzed both in time and frequency domain to determine the defluidization time. Furthermore, the shape and size of the bed material after the experiments were evaluated. Higher defluidization times in the case of sepiolite were measured. Particle sizes were affected by the type of bed material and the air excess and agglomerates of different shapes were formed for sepiolite and silica sand.
机译:这项工作研究了Cynara cardunculus L.在气化流化床(BFB)反应器中的流化时间和附聚物的产生。分别使用两种不同的床料,硅砂和海泡石〖(MG〗_8〖Si〗_12 O_30(OH) )_4〖((OH} _2)(_ 4 ^)8 H_2}。海泡石的高吸附能力和元素组成使其适合用作替代床层材料,以减少团聚。实验是在不锈钢实验室规模的BFB反应器上进行的,该反应器以空气作为气化剂,以不同的空气过量比(u / umf)运行。另外,还可以使用石英反应器在气化过程中观察床层材料和生物质,以观察团聚体形成过程。在时域和频域均分析了压力信号,以确定去流体时间。此外,评估了实验后的床材料的形状和尺寸。在海泡石的情况下,需要更长的脱液时间。颗粒尺寸受床料类型的影响,并且海泡石和硅砂形成的空气过量并形成了不同形状的附聚物。

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