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首页> 外文期刊>Powder Technology: An International Journal on the Science and Technology of Wet and Dry Particulate Systems >Implementation of Faraday cup electrostatic charge measurement technique in high-pressure gas-solid fluidized beds at pilot-scale
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Implementation of Faraday cup electrostatic charge measurement technique in high-pressure gas-solid fluidized beds at pilot-scale

机译：法拉第杯静电荷测量技术在高压气固流化床中试规模的实现

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摘要

Elevation of operating pressure in gas-solid fluidized beds affects the bed hydrodynamics, which in turn could affect the extent of bed electrification and reactor wall coating due to electrostatic charge generation. In this work, a pilot plant high-pressure gas-solid fluidization system housing the Faraday cup electrostatic charge measurement technique is introduced in order to study the underlying mechanism of electrostatic charge generation causing fluidized bed wall fouling at pressures up to 25 barg. A previously developed on-line electrostatic charge measurement technique containing two Faraday cups was successfully implemented in the high-pressure system. The effect of operating pressure on gas-solid fluidized bed electrification was examined under operating pressures of 0 and 25 bar (gauge) by fluidizing polyethylene resin directly received from a commercial reactor. Experimental results showed that the magnitude of reactor wall coating increased with the increase of operating pressure. The wall coating contained positively as well as negatively charged particles indicating the occurrence of bipolar charging within the fluidized bed. Finally, based on the experimental results obtained in this work the mechanism of fluidized bed column wall coating formation was discussed. (C) 2015 Elsevier B.V. All rights reserved.
机译：气固流化床中操作压力的升高会影响床的流体动力学，进而由于产生静电荷而影响床的电气化程度和反应器壁涂层。在这项工作中，引入了一个中试设备高压气固流化系统，该系统采用法拉第杯静电荷测量技术，以研究静电荷产生的基本机理，该机制导致流化床壁在最高25 barg的压力下结垢。高压系统成功实施了先前开发的包含两个法拉第杯的在线静电荷测量技术。通过在0和25巴（表压）的工作压力下，通过流化直接从工业反应器接收的聚乙烯树脂，来检查工作压力对气固流化床带电的影响。实验结果表明，反应器壁涂层的大小随工作压力的增加而增加。壁涂层包含带正电和带负电的颗粒，表明在流化床中发生了双极性带电。最后，根据这项工作获得的实验结果，讨论了流化床塔壁涂层形成的机理。 （C）2015 Elsevier B.V.保留所有权利。

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