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Evaluation of the start-up of hydraulic conditions of a fluidised bed system
Environmental Technology ( IF 2.8 ) Pub Date : 2021-06-15 , DOI: 10.1080/09593330.2021.1939794
Ricardo Gonçalves de Morais 1 , Sérgio Michelotto Braga 1 , Maria Cristina Borba Braga 1
Affiliation  

ABSTRACT

The development of this research was based on the analysis of an anaerobic fluidised bed reactor from the assembly of its components to the sealing of the system and further fluidisation. A hydrometer and a Venturi were used to identify the best means of measuring the flow rate. Results produced by both devices were similar, however, the latter was less effective due to the low flow rates necessary to operate the system. The hydrometer was the most adequate device for flow rate measurements in the range between 0.1 and 1.0 m³/h, whereas the Venturi proved to be an adequate device for the flow in the range between 0.3 and 0.7 m³/h. Sand with grain sizes varying from 357 to 1000 µm was used as support material. It was not observed statistically significant differences between the minimum fluidisation velocities related to the amount of supported material of 20% and 40% (VSM/Vusable) added to the reactor. Forty percent of the usable volume occupied with sand is adequate to reach fluidisation, instead of only the expansion of the bed. The fluidisation velocities for the sand grain size of 357 µm were 8.4 m/h ± 0.25 for 20%, and 8.6 m/h ± 0.30 for 40%, whereas for the 505 µm they were, respectively for 20% and 40%, 9.2 m/h ±0.70 and 10.1 m/h ± 0.37. The hydraulic tests allow to stress that sand grain sizes varying from 357 to 505 µm are recommended to be used in a system with similar characteristics.



中文翻译:

评估流化床系统的水力条件启动

摘要

这项研究的发展是基于对厌氧流化床反应器从组件组装到系统密封和进一步流化的分析。比重计和文丘里管用于确定测量流速的最佳方法。两种设备产生的结果相似,但是,由于操作系统所需的低流速,后者效果较差。比重计是测量 0.1 至 1.0 m³/h 范围内流量的最合适设备,而文丘里管被证明是测量 0.3 至 0.7 m³/h 范围内流量的合适设备。粒度从 357 到 1000 µm 不等的沙子用作支撑材料。V SM / V可用)添加到反应堆。沙子占据的可用体积的 40% 足以实现流化,而不仅仅是床层的膨胀。357 µm 砂粒尺寸的流化速度分别为 8.4 m/h ± 0.25(20%)和 8.6 m/h ± 0.30(40%),而 505 µm 砂粒尺寸分别为 20% 和 40%、9.2 m/h ±0.70 和 10.1 m/h ± 0.37。水力测试强调,建议在具有相似特性的系统中使用粒度从 357 到 505 µm 不等的沙粒。

更新日期:2021-06-15
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