电容层析成像

电容层析成像 (ECT) 是一种获得容器和管道过程状况信息的测量技术。在固定位置的容器边界周围装上多电极,不影响流或物质的移动。电绝缘管道的电极可以装在外部,导电管道的电 极必须装在内部。典型用途是在管道中对多组分流进行实时监测。经证实,ECT 还可以用在固气和液(有机)气系统(如流化床)、气动输送和多相流等特点的用途中。原则上,ECT 可以用来研究和监测任何主连续相非导电与其它相及组件有不同电容值的过程。

An ECT system produces a cross-sectional image showing the distribution of electrical permittivity of the contents of a process vessel or pipeline from measurements taking at the boundary of the vessel. 

Our m3000 system injects a voltage on to an electrode and measures the resultant voltage difference between this and other electrodes according to a pre-defined measurement protocol.

This interrogates an entire ‘slice' through the measurement zone - analogous to a ‘body-scan' in medical imaging. A single measurement set for a 12-electrodes sensors consists of 66 voltage measurements. The voltage measurements are processed by an image reconstruction algorithm to determine the electrical permittivity distribution.

什么是 ECT?

ECT是电容层析成像 (Electrical Capacitance Tomography) 的简称。ECT 应用于测量介质为非导电性的情况下。在 ECT 层片中,红色代表高介电(如石油),蓝色代表低介电(如气体)。

在我的过程中应该使用 ERT/ECT 吗?

当连续相为导电物质(如水酸碱和离子溶液)时,应采用 ERT 系统。当连续相为非导电物质(如气/油)时,应采用 ECT 系统。如果过程从导电物质移至非导电物质或反之,建议组合采用 ECT 和 ERT 双模系统。聚合,燥化或多相流过程则为其示例。

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