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提出了一种非侵入式同时测量气固两相流型和电荷分布的可视化测试方法。数值仿真结果表明,ECT提供的介电常数分布信息可用于修正实际流型下的EST电荷灵敏场,降低了电荷分布反演的不确定性,EST的图像重建误差有所减小,有效的提高了电荷分布反演的精度。将该测试方法分别应用于粉体重力输送系统和高压密相气力输送系统,结果表明重力输送试验中颗粒浓度大的区域电荷密度值较大,而在气力输送试验中,颗粒浓度大的区域,电荷密度值反而较小,且随着管内煤粉颗粒浓度的增加,粉体总的电荷强度值减小。
A non-invasive visual test method for simultaneous measurement of gas-solid two-phase flow patterns and charge distribution is proposed. The numerical simulation results show that the information of dielectric constant provided by ECT can be used to correct the EST charge sensitivity field under the actual flow pattern and reduce the uncertainty of the inversion of charge distribution. The error of EST image reconstruction is reduced and effectively increased The accuracy of the charge distribution inversion. The test method was applied to the powder gravity conveying system and the high pressure dense phase pneumatic conveying system respectively. The results show that in the gravity conveying test, the density of the particles with large particle concentration is larger, while in the pneumatic conveying experiment, The charge density value is smaller, and with the increase of pulverized coal particle concentration in the tube, the total charge intensity value of the powder decreases.