Staggered electrode type capacitance layer analysis imaging device applicable to low-temperature fluid

Abstract

The invention discloses a staggered electrode type capacitance layer analysis imaging device applicable to low-temperature fluid. The device is applicable to capacitance layer analysis imaging of flowing and flow pattern monitoring and void fraction measurement of deep low-temperature fluid (such as liquid nitrogen (-78K), liquid oxygen (-90K)) tubes. The device is characterized in that electrodechips are staggered, so that the total span of the electrodes in the circumferential direction is up to 360 degrees; the maximum span of each electrode is ensured while the quantity of the electrode chips is increased; and the characteristic that the amount of contraction of polytetrafluoroethylene under low-temperature fluid is beyond that of metal is utilized, polytetrafluoroethylene is utilizedfor manufacturing a limiting sleeve and a fastening sleeve for fastening the electrode chips, and thus the assembling positions of the electrode chips can be fixed. The device has the characteristicsof being simple in structure, quick to dismount and mount, applicable to large range from room temperature to deep low temperature, free from influence on measurement accuracy under wide-margin temperature circulation for multiple times, high in electrode chip covering rate, high in measurement imaging accuracy, and good in structure electromagnetic shielding effect.

Description

technical field [0001] The invention relates to the fields of cryogenic refrigeration engineering technology and sensor science and technology, in particular to an interdigitated electrode capacitance tomography (ECT) device applied to cryogenic fluids. Background technique [0002] Two-phase flow in pipes often occurs in fluid-related industries such as chemical industry and air separation, and involves design optimization and operation safety. Therefore, the detection of two-phase distribution is of great significance. Electrical Capacitance Tomography (ECT) technology utilizes the characteristics of different total dielectric constants of different phase contents in micro-elements in the field, and measures the capacitance value between two pairs of multi-pole plates, and uses the inversion algorithm to analyze Solving and imaging the phase distribution of the fluid in each micro-element is a non-invasive measurement technology, which has the advantages of fast response s...

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Problems solved by technology

[0006] Chinese patent CN102364420B discloses a high-precision ECT smart sensor. The sensor part of the invention is perforated on the insulating pipe, the electrode sheet is directly in contact with the fluid, and the electrode sheet is fixed by bolts, which is quite different from the structure of the present invention.

[0012] U.S. Patent No. 7,496,450B2 discloses a multiphase flow imaging monitoring method based on electrical capacitance tomography technology. This patent specifies the distribution of sensors but does not design the installation structure of the sensors. The electrodes are on the same ring surface, which is similar to this patent There is a big difference

[0013] U.S. Patent US8461852B2 discloses a method for monitoring particle distribution in a fluidized bed based on electrical capacitance tomography. The electrodes of the ECT sensor are fixed by being embedded in the outer wall of the pipeline, and the electrode pieces are on the same ring surface. There is a big difference in structure from the structure of this patent

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