Alkali metal emission from filter ash and fluidized bed material from PFB gasification of biomass
Alkali metal emission from filter ash and fluidized bed material from PFB gasification of biomass
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DOI：
10.1021/ef970211y
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发表时间：
1998-04
期刊：
影响因子：
5.3
通讯作者：
John G. Olsson;J. Pettersson;N. Padban;I. Bjerle
中科院分区：
文献类型：
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作者：
John G. Olsson;J. Pettersson;N. Padban;I. Bjerle
对全床生物质气化中试装置收集的原料的碱金属排放进行了表征。将不同操作条件下的碳化硅滤灰和沸腾床颗粒样品在氮气气氛中恒定升温至1000℃，并用表面电离技术连续监测碱金属的排放。对于所有样品，确定了两个特征发射间隔。在100-500摄氏度的范围内，释放出一小部分碱金属含量。在600摄氏度以上，碱金属的释放急剧增加，并且上升接近指数，直到900摄氏度。对于沸腾床颗粒，凝聚体的碱金属释放明显低于1天内使用的物料，这归因于形成较不挥发的化合物。对于滤灰样品，经过较长的滤池清洗间隔后，样品的碱金属释放量增加，说明滤层的形成提高了碱捕集效率。(更少)
The alkali metal emission from materials collected in a PFB biomass gasification pilot plant has been characterized. Samples of SiC filter ash and fluidized bed particles from different operating conditions were subjected to a constant heating rate up to 1000 degrees C in a nitrogen atmosphere, and the alkali metal emission was monitored continuously by a surface ionization technique. For all samples, two characteristic emission intervals are identified. In the range 100-500 degrees C, a small fraction of the alkali metal content is emitted. Above 600 degrees C, the alkali metal release increases sharply and the rise is close to exponential up to 900 degrees C. For fluidized bed particles, the alkali metal emission is significantly lower for agglomerates compared to material used during 1 day, which is attributed to the formation of less volatile compounds. For the filter ash samples, the alkali metal emission is enhanced in samples collected after longer filter cleaning intervals, indicating that the formation of a filter deposit improves the alkali capture efficiency. (Less)