A mobile capacitance tomography sensor and imaging device

Abstract

The present invention discloses a mobile capacitance tomography sensor and imaging device, which belongs to the field of sensor application technology and can solve the problem that the prior art cannot realize simultaneous online visual measurement of the internal fluidization state of multiple bed layers of a circulating fluidized bed. The sensor includes: N sensor sliders, a scale metal rod with scales, and a fixing piece; the inner wall of each sensor slider is in contact with the outer wall of the bed of the circulating fluidized bed, and each sensor slider can move up and down along the outer wall of the bed; the N sensor sliders are connected in series by the scale metal rod, and each sensor slider can be fixed at different scale positions of the scale metal rod by the fixing piece according to the measurement needs; the sensor slider is a capacitance tomography sensor, and the sensor slider is used to monitor the internal fluidization state of the bed layer of the circulating fluidized bed and the change of the dielectric constant of the cross-sectional medium. The present invention is used for imaging sensors.

Description

Technical Field

[0001] The invention relates to a mobile capacitance tomography sensor and an imaging device, belonging to the technical field of sensor application. Background Art

[0002] Circulating fluidized bed reactors have a very broad application field and prospects in industry. Through a precise circulation control system, the circulating fluidized bed reactor allows the catalytic reaction and the rapid regeneration of the catalyst to be carried out in different systems, and through circulation coupling, a regeneration circulation system is formed to achieve the integration of production and catalyst regeneration, and maintain the stability of the catalyst amount in the fluidized bed. This not only solves the problem of catalyst deactivation, but also has a large production capacity and high production efficiency, and realizes the continuity of the production process.

[0003] The structure of a circulating fluidized bed is relatively complex, and the particle distribution state of different bed layers affects the results of the catalytic reaction. The particle movements of each bed layer are closely related. Therefore, online real-time visual imaging of multiple beds in a confined space flow process is of great significance for the control of the fluidized operation state of the circulating fluidized bed.

[0004] ECT refers to electrical capacitance tomography, which is a measurement technology that uses the functional relationship between capacitance and the dielectric constant of the measured medium to reconstruct the dielectric constant distribution of the measured medium through multiple pairs of capacitance values. When used in fluidized bed measurements, the solid concentration distribution in the measured area can be obtained. It has the characteristics of fast imaging speed, no radiation, and low cost.

[0005] There are several key issues to be addressed in designing a mobile electrical capacitance tomography sensor that can be used for multi-layer measurement in a circulating fluidized bed:

[0006] The first is to modularize the sensor design to make it movable. The accurate measurement of the capacitive signal needs to be solved, and the design of the electrode must be solved first.

[0007] The second is that the sensor module is separated from the circulating fluidized bed, and the electrode moves outside the circulating fluidized bed. The size of the gap between the electrode and the bed affects the test results, and the sensor accessories need to be precisely processed.

[0008] The third is the arbitrary combination of multiple sensor components, with one device having multiple uses, requiring strict size matching and precise positioning.

[0009] The fourth is the manufacturing process problem. The mobile electrical capacitance tomography sensor for measuring multiple layers of a circulating fluidized bed contains multiple sensor modules and numerous signal lines, which are extremely difficult to arrange. To obtain high-quality signals, the manufacturing process must be meticulous and highly consistent.

[0010] The fifth is the processing and analysis of multi-level acquisition parameters, as well as the discussion of correlations and rules.

[0011] So far, there has been no report on the mobile capacitance tomography sensor technology that can be used for measuring multiple layers of a circulating fluidized bed. The mobile imaging device based on capacitance tomography sensors in the prior art is limited to tomography testing of solid objects, and has not been used for gas-solid two-phase fluidization detection of a fluidized bed, nor has it achieved simultaneous detection of multiple layers of a fluidized bed, and has not been applied to chemical and catalytic reactions. Summary of the invention

[0012] The present invention provides a mobile capacitance tomography sensor and an imaging device, which can solve the problem in the prior art that simultaneous online visual measurement of the internal fluidization states of multiple bed layers of a circulating fluidized bed cannot be achieved.

[0013] On the one hand, the present invention provides a mobile capacitance tomography sensor, comprising: N sensor sliders, a scale metal rod with scales, and a fixing member; the inner wall of each of the sensor sliders is in contact with the outer wall of the bed body of a circulating fluidized bed, and each of the sensor sliders can move up and down along the outer wall of the bed body; the N sensor sliders are connected in series using the scale metal rods, and each of the sensor sliders can be fixed at different scale positions of the scale metal rod through the fixing member according to measurement needs; the sensor slider is a capacitance tomography sensor, and the sensor slider is used to monitor the fluidization state inside the bed layer of the circulating fluidized bed and the change in the dielectric constant of the cross-sectional medium; wherein N is greater than or equal to 2.

[0014] Optionally, the sensor slider is a single-layer electrode slider or a multi-layer electrode slider; the single-layer electrode slider is a slider with multiple measuring electrodes arranged in a single layer; the multi-layer electrode slider is a slider with multiple measuring electrodes arranged in multiple layers; the measurement spacing of the multi-layer electrode slider is smaller than the measurement spacing of the single-layer electrode slider.

[0015] Optionally, each of the sensor sliders includes an array measuring electrode, an electrode support tube, an upper supporting flange, a lower supporting flange, an axial end shielding electrode, a signal transmission line and an outer shielding cover; the array measuring electrodes are evenly arranged on the inner wall of the electrode support tube, and each measuring electrode has an extended end extending out of the electrode support tube in the axial direction of the electrode support tube, and the extended end includes a bonding area and a welding area, the bonding area is attached to the end surface of the electrode support tube, and the welding area is located on the outside of the end surface of the electrode support tube for welding with the signal transmission line; the upper supporting flange and the lower supporting flange are respectively arranged at both ends of the electrode support tube; the upper supporting flange and the lower supporting flange are both made of The sensor device is composed of a flange and a flange, wherein the inner diameter of the flange is adapted to the diameter of the circulating fluidized bed, and the outer diameter of the flange is equal to the outer diameter of the electrode support tube; the shaft end shielding electrode is annular, sleeved on the middle of the outer wall of the flange, and kept insulated from the measuring electrode; a series hole is provided on the flange, and the scale metal rod passes through the series hole to connect N sensor sliders in series; the flange is also provided with a transverse threaded hole, and the transverse threaded hole is used to fix the sensor slider; an outer shielding cover is provided on the axial outer side of the array measuring electrode and the shaft end shielding electrode, and the outer shielding cover covers the entire array measuring electrode and the shaft end shielding electrode, and keeps insulated from the array measuring electrode.

[0016] Optionally, the shaft end shielding electrode is made of the same material as the measuring electrode.

[0017] Optionally, when the sensor slider is a multi-layer electrode slider, the sensor slider also includes an interlayer shielding electrode arranged between adjacent measuring electrodes, and a support ring for supporting the interlayer shielding electrode; the support ring is made of insulating material, and its inner diameter is equal to the inner diameter of the flange tube, and its outer diameter is equal to the outer diameter of the flange tube; the interlayer shielding electrode is annular and is sleeved on the outer wall of the support ring.

[0018] Optionally, the height of the interlayer shielding electrode is smaller than the height of the support ring and is located in the center area of ​​the support ring; the interlayer shielding electrode remains insulated from the measuring electrode.

[0019] Optionally, the electrode support tube, the upper support flange, the lower support flange, and the support ring are all made of insulating materials; the array measurement electrode, the axial end shielding electrode, the interlayer shielding electrode, and the outer shielding cover are made of metal materials with conductive properties.

[0020] Optionally, each layer of the array measuring electrodes is provided with M sheet-shaped measuring electrodes of the same size, wherein the value of M is an integer of 8 to 16; and the effective length of the measuring electrode is equal to the length of the electrode support tube.

[0021] Optionally, the length of the measuring electrode is greater than the sum of the height of the electrode support tube and twice the thickness of the tube wall of the electrode support tube.

[0022] Optionally, the difference between the inner diameter of the electrode support tube and twice the thickness of the measuring electrode is adapted to the diameter of the circulating fluidized bed tube.

[0023] Optionally, the assembly formed by the measuring electrode and the electrode support tube is coaxially bonded to the end of the flange tube with an adhesive; the multiple serial holes on the flange plate are coaxial; and the support ring is coaxial with the flange tube.

[0024] Optionally, the adhesive is an insulating adhesive.

[0025] Optionally, the signal transmission line is a double-shielded line consisting of a cable core, an insulating layer and a shielding wire mesh; the outer shielding cover, the axial end shielding electrode and the interlayer shielding electrode are all connected to the shielding wire mesh; the shielding wire mesh is used to connect to an external grounding wire; the welding area of ​​the protruding end of the measuring electrode is welded to the cable core, and the cable core is used to output the signal detected by the measuring electrode.

[0026] On the other hand, the present invention provides an imaging device, which includes: a signal acquisition module, an imaging display module, a high-temperature microreactor, and a mobile capacitance tomography sensor as described in any one of the above; the mobile capacitance tomography sensor is mounted on the outer wall of the fluidizing chamber of the high-temperature microreactor and is in contact with the outer wall of the fluidizing chamber to obtain capacitance data; the signal acquisition module is electrically connected to the mobile capacitance tomography sensor to obtain the capacitance tomography signal collected by the mobile capacitance tomography sensor; the imaging display module is electrically connected to the signal acquisition module to reconstruct an image of the capacitance tomography signal collected by the signal acquisition module.

[0027] The beneficial effects that the present invention can produce include:

[0028] (1) The mobile electrical capacitance tomography sensor provided by the present invention modularizes the sensor design and changes the conventional structure of the ECT sensor electrode being attached to the fluidized bed. The same sensor slider can measure multiple different bed layers of the bed, thereby saving costs and improving test efficiency.

[0029] (2) The mobile capacitance tomography sensor provided by the present invention has a sensor electrode separated from the bed body. During the calibration process, there is no need for full-tube calibration on the high bed layer. As long as calibration is performed on the bottom bed layer, the full-tube calibration data can be substituted into the high bed layer calibration. One calibration can be used multiple times, saving time and materials.

[0030] (3) The mobile capacitance tomography sensor provided by the present invention can be combined with multiple sensor sliders in any way, and can simultaneously measure the fluidization state of multiple different bed layers of the fluidized bed according to the use requirements, so as to achieve online visualization of the internal fluidization state of the multiple bed layer interfaces, and can also monitor in real time the internal state changes reflected by the changes in the dielectric constants of the internal media of the multiple interfaces of the circulating fluidized bed; at the same time, since the states of the multiple bed layers of the circulating fluidized bed are measured synchronously, the correlation between the various bed layers during the operation of the circulating fluidized bed can be found, and the fluidization state law of the entire working process of the circulating fluidized bed can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of the structure of a mobile electrical capacitance tomography sensor that can be used for measuring multiple layers of a circulating fluidized bed provided by an embodiment of the present invention;

[0032] Figure 2 A schematic diagram of the structure of a single ECT sensor slider provided by an embodiment of the present invention;

[0033] Figure 3 for Figure 2 A schematic diagram of the enlarged cross section in the B-B' direction;

[0034] Figure 4 for Figure 2 Schematic diagram of the longitudinal section of a single-layer electrode slider in the A-A' direction;

[0035] Figure 5 for Figure 2 Schematic diagram of the longitudinal section of the multilayer electrode slider in the A-A' direction;

[0036] Figure 6 A schematic diagram of the structure of the measuring electrode and the electrode support tube provided in an embodiment of the present invention;

[0037] Figure 7 A schematic diagram of the flange pipe and shaft end shielding electrode structure provided in an embodiment of the present invention;

[0038] Figure 8 A schematic diagram of the support ring and interlayer shielding electrode structure provided by an embodiment of the present invention;

[0039] Fig. 9 A schematic diagram of a metal rod with a scale provided by an embodiment of the present invention;

[0040] Fig.10 A schematic structural diagram of an imaging device provided by an embodiment of the present invention.

[0041] List of parts and reference numerals:

[0042] 100. Sensor slider; 101. Measuring electrode; 102. Electrode support tube; 103. Support ring; 104. Interlayer shielding electrode; 105. Upper support flange; 106. Lower support flange; 107. Shaft end shielding electrode; 108. Outer shielding cover; 109. Signal transmission line; 110. Flange; 111. Flange tube; 112. Horizontal threaded hole; 113. Series hole; 200. Scale metal rod; 201. Fixing piece; 300. Signal acquisition module; 400. Imaging display module. DETAILED DESCRIPTION

[0043] The present invention is described in detail below in conjunction with embodiments, but the present invention is not limited to these embodiments.

[0044] The embodiment of the present invention provides a mobile capacitance tomography sensor, such as Figures 1 to 10 As shown, it includes: N sensor sliders 100, a scale metal rod 200 with scales, and a fixing member 210; the sensor slider 100 is a capacitance tomography sensor, that is, an ECT sensor; the capacitance data collected by the N ECT sensor sliders 100 are sent to the capacitance tomography signal acquisition module 300 via a signal transmission line 109, and then transmitted to the imaging display module 400 by the capacitance tomography signal acquisition module 300 to complete image reconstruction and other processing.

[0045] See also Figure 2 , Figure 3 , Figure 4 , Figure 5 , a mobile capacitance tomography sensor that can be used for measuring multiple layers of a circulating fluidized bed. Here, a circulating fluidized bed with an outer diameter of 45.5 mm is selected as the test target. Each sensor slider 100 includes an array measuring electrode 101, an electrode support tube 102, an upper supporting flange 105, a lower supporting flange 106, an axial end shielding electrode 107, a signal transmission line 109, and an outer shielding cover 108; a multi-layer electrode slider adds a supporting ring 103 and an interlayer shielding electrode 104 between adjacent measuring electrodes 101.

[0046] The electrode support tube 102, the upper support flange 105, the lower support flange 106, and the support ring 103 are made of insulating materials (organic glass can be used in the present invention), the array measurement electrode 101, the axial end shielding electrode 107, and the interlayer shielding electrode 104 are made of metal materials with good conductive properties (such as copper foil materials), and the outer shielding cover 108 is made of metal materials with good conductive properties and moderate thickness (such as 0.5 mm thick copper foil).

[0047] The array measuring electrodes 101 of the sensor slider 100 are evenly arranged on the inner wall of the electrode support tube 102. Each layer of the array measuring electrodes 101 includes M sheet measuring electrodes of the same size, where M is an integer from 8 to 16. The effective length of the measuring electrode 101 is the same as that of the electrode support tube 102. Different values ​​can be selected for the effective length of the measuring electrode 101 depending on the purpose.

[0048] A 0.05 mm thick copper foil with self-adhesive tape is selected as the electrode material of the measuring electrode. The length of a single electrode cut is longer than the sum of the electrode support tube 102 and twice the wall thickness of the electrode support tube 102. Taking an electrode support tube 102 with a length of 40 mm, a wall thickness of 3 mm, and an inner diameter of 45.8 as an example: the cut electrode length is 56 mm (effective length 40 mm) to ensure that the measuring electrode 101 has a 5 mm protruding end after it is attached to the inner wall and both ends of the electrode support tube 102 and attached to the outer wall of the electrode support tube 102 for welding the signal transmission line 109.

[0049] The inner wall of the electrode support tube 102 is slightly larger than the sum of the diameter of the circulating fluidized bed tube and twice the thickness of the measuring electrode 101, to ensure smooth movement and fit with the outer wall of the circulating fluidized bed.

[0050] The upper support flange 105 and the lower support flange 106 of the capacitance tomography sensor slider 100 have the same structure and are composed of a flange tube 111 and a flange plate 110. The upper support flange 105 and the lower support flange 106 are arranged at both ends of the electrode support tube 102. The inner diameter of the flange tube 111 is slightly larger than the diameter of the circulating fluidized bed tube, and the outer diameter of the flange tube 111 is equal to the outer diameter of the electrode support tube 102. The outer wall of the flange tube 111 is provided with an axial end shielding electrode 107. The flange plate 110 is provided with radial series holes 113 for serially connecting a scale metal rod 200 with a scale. The diameter of the series holes 113 on the flange plate 110 is consistent with the diameter of the scale metal rod 200 with a scale (for example, it can be 10 mm). The flange plate 110 is provided with a corresponding thickness (10 mm). The flange plate 110 is provided with a transverse threaded hole 112 in the middle of one side of the flange plate 110 close to the series hole 113 for fixing the position of each ECT sensor slider 100 to control its height position in the circulating fluidized bed.

[0051] The shaft end shielding electrode 107 is made of the same material as the measuring electrode 101 . The shaft end shielding electrode 107 is arranged in the middle of the flange tube 111 and is insulated from the measuring electrode 101 .

[0052] refer to Figure 5As shown, to make a multi-layer electrode slider, it is necessary to add a support ring 103 and an interlayer shielding electrode 104 assembly between adjacent measuring electrodes 101 and electrode support tube 102 assemblies. The support ring 103 is made of insulating material (in this embodiment, it can be organic glass), and its inner and outer diameters are equal to the inner and outer diameters of the flange tube 111. A ring-shaped interlayer shielding electrode 104 is attached to the middle of the outer wall of the support ring 103; the height of the interlayer shielding electrode 104 is less than the height of the support ring 103, and it is located in the middle of the support ring to maintain insulation from the measuring electrode 101.

[0053] The electrode support tube 102 is coaxially bonded to one end of the flange tube 111 of the upper support flange 105 and the lower support flange 106 respectively with an organic insulating adhesive (AB glue can be used in this embodiment), and at the same time, the series holes 113 on the flange plate 110 must also be coaxial to form a whole.

[0054] A sensor slider 100 containing multiple layers of electrodes, wherein a support ring 103 and an interlayer shielding electrode 104 assembly are placed between adjacent measuring electrodes 101 and electrode support tube 102 assemblies, are bonded together with an organic insulating adhesive and maintained axially coaxially to form a multi-layer measuring electrode assembly, and then the assembly is coaxially bonded to one end of the flange tube 111 of the upper support flange 105 and the lower support flange 106 to form a whole.

[0055] During all bonding processes, the coaxiality must be strictly maintained while ensuring that the inner walls of each tube are clean and smooth.

[0056] An outer shielding cover 108 is arranged axially outside the array measurement electrode 101 and the axial end shielding electrode 107 (including the interlayer shielding electrode 104 ), and the outer shielding cover 108 covers the entire array measurement electrode 101 and the axial end shielding electrode 107 (including the interlayer shielding electrode 104 ) and maintains insulation from the array measurement electrode 101 .

[0057] N ECT sensor sliders 100 are connected in series with a scaled metal rod 200, and each ECT sensor slider 100 is fixed at a different scale position by a fixing member (which can be a fixing screw) 201 according to measurement requirements; in this embodiment, the scaled metal rod 200 is a customized stainless steel rod with a diameter of 10 mm and engraved with length units, and the length is determined according to the height of the circulating fluidized bed; the fixing screws are M3 screws of appropriate length.

[0058] The ECT sensor sliders 100 used on the same circulating fluidized bed body are kept coaxial; the axis is the axis of the circulating fluidized bed body tube.

[0059] The diameter of the scale metal rod 200 is equal to the diameter of the series holes 113 on the flange 110 , and the series holes 113 of the flanges 110 of all ECT sensor sliders 100 maintain the same height.

[0060] refer to Fig.10 As shown, the signal transmission line 109 is a double shielded line composed of a cable core, an insulating layer and a shielding wire mesh; the axial end shielding electrode 107, the interlayer shielding electrode 104, and the outer shielding cover 108 are connected to the shielding wire mesh of the signal transmission line 109, and are grounded via the connection ground wire between the shielding wire mesh of the signal transmission line 109 and the capacitance tomography signal acquisition module 300; the welding area of ​​the reserved extended end of the measuring electrode 101 is welded to the cable core of the signal transmission line 109, and is connected to the capacitance tomography signal acquisition module 300 via the cable core of the signal transmission line 109. The collected capacitance data is sent to the capacitance tomography signal acquisition module 300 via the signal transmission line 109, and then transmitted to the imaging display module 400 by the capacitance tomography signal acquisition module 300 to complete image reconstruction.

[0061] The N sensor sliders 100 can be used in combination or independently as a single sensor according to needs.

[0062] The capacitance data collected by the multiple capacitance tomography sensor sliders 100 according to the number of electrodes of each slider is input into one or more capacitance tomography signal acquisition modules 300, and then transmitted to the imaging display module 400 by the capacitance tomography signal acquisition module 300 to complete data processing and image reconstruction, thereby obtaining important information such as different bed layers of the circulating fluidized bed and the correlation between the bed layers.

[0063] In the embodiment of the present invention, the diameter of the circulating fluidized bed is 45.5 mm, and the design size of the ECT sensor slider 100 applied to bed modules of other sizes can be changed accordingly. The measuring electrode 102 of the ECT sensor slider 100 of the present application is 40 mm long. The size and number of the measuring electrodes 102 can be designed in various ways according to the circumference of the circulating fluidized bed, the spacing and length of the measuring electrodes 102, and are not limited to the above parameter design.

[0064] The above are only a few embodiments of the present application and do not constitute any form of limitation to the present application. Although the present application is disclosed as above with preferred embodiments, it is not intended to limit the present application. Any technician familiar with the profession, without departing from the scope of the technical solution of the present application, using the technical content disclosed above to make slight changes or modifications are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A mobile electrical capacitance tomography sensor, characterized in that: include: N sensor sliders, metal rods with scales, and fixings; The inner wall of each sensor slider is in contact with the outer wall of the circulating fluidized bed, and each sensor slider moves up and down along the outer wall of the circulating fluidized bed; N sensor sliders are connected in series by the scale metal rod, and each sensor slider is fixed to a different scale position of the scale metal rod by the fixing member according to measurement requirements; The sensor slider is a capacitance tomography sensor, and the sensor slider is used to monitor the fluidization state inside the bed layer of the circulating fluidized bed and the change in the dielectric constant of the cross-sectional medium; wherein N is greater than or equal to 2.

2. The mobile electrical capacitance tomography sensor according to claim 1, characterized in that: The sensor slider is a single-layer electrode slider or a multi-layer electrode slider; The single-layer electrode slider is a slider in which a plurality of measuring electrodes are arranged in a single layer; The multi-layer electrode slider is a slider with multiple measuring electrodes arranged in multiple layers; The measuring pitch of the multi-layer electrode slider is smaller than the measuring pitch of the single-layer electrode slider.

3. The mobile electrical capacitance tomography sensor according to claim 2, characterized in that: Each of the sensor sliders comprises an array measuring electrode, an electrode support tube, an upper support flange, a lower support flange, a shaft end shielding electrode, a signal transmission line and an outer shielding cover; The array measuring electrodes are evenly arranged on the inner wall of the electrode support tube, each measuring electrode has an extended end extending out of the electrode support tube in the axial direction of the electrode support tube, the extended end includes a bonding area and a welding area, the bonding area is attached to the end surface of the electrode support tube, and the welding area is located outside the end surface of the electrode support tube and is used for welding with the signal transmission line; The upper support flange and the lower support flange are respectively arranged at both ends of the electrode support tube; the upper support flange and the lower support flange are both composed of a flange tube and a flange plate; the inner diameter of the flange tube is adapted to the diameter of the circulating fluidized bed tube, and the outer diameter of the flange tube is equal to the outer diameter of the electrode support tube; The shaft end shielding electrode is annular, sleeved on the middle of the outer wall of the flange tube, and insulated from the measuring electrode; a series hole is provided on the flange, and the scale metal rod passes through the series hole to connect N sensor sliders in series; the flange is also provided with a transverse threaded hole, and the transverse threaded hole is used to fix the sensor slider; An outer shielding cover is provided on the axial outer side of the array measuring electrode and the shaft end shielding electrode, and the outer shielding cover covers the entire array measuring electrode and the shaft end shielding electrode and maintains insulation with the array measuring electrode; The shaft end shielding electrode and the measuring electrode are made of the same material.

4. The mobile electrical capacitance tomography sensor according to claim 3, characterized in that: When the sensor slider is a multi-layer electrode slider, the sensor slider further includes an interlayer shielding electrode disposed between adjacent measuring electrodes, and a supporting ring for supporting the interlayer shielding electrode; The support ring is made of insulating material, and its inner diameter is equal to the inner diameter of the flange pipe, and its outer diameter is equal to the outer diameter of the flange pipe; the interlayer shielding electrode is annular and sleeved on the outer wall of the support ring.

5. The mobile electrical capacitance tomography sensor according to claim 4, characterized in that: The height of the interlayer shielding electrode is smaller than the height of the support ring and is located in the central area of ​​the support ring; the interlayer shielding electrode is insulated from the measuring electrode.

6. The mobile electrical capacitance tomography sensor according to claim 4 or 5, characterized in that: The electrode support tube, the upper support flange, the lower support flange, and the support ring are all made of insulating materials; The array measuring electrodes, the shaft end shielding electrodes, the interlayer shielding electrodes and the outer shielding cover are made of metal materials with conductive properties.

7. The mobile electrical capacitance tomography sensor according to claim 3, characterized in that: Each layer of the array measuring electrodes is provided with M sheet-shaped measuring electrodes of the same size, wherein the value of M is an integer of 8 to 16; The effective length of the measuring electrode is equal to the length of the electrode support tube; The length of the measuring electrode is greater than the sum of the height of the electrode support tube and twice the thickness of the tube wall of the electrode support tube; The difference between the inner diameter of the electrode support tube and twice the thickness of the measuring electrode is adapted to the diameter of the circulating fluidized bed tube.

8. The mobile electrical capacitance tomography sensor according to claim 4, characterized in that: The assembly formed by the measuring electrode and the electrode support tube is coaxially bonded to the end of the flange tube by an adhesive; the serial holes on the plurality of flanges are coaxial; The support ring is coaxial with the flange pipe; The adhesive is an insulating adhesive.

9. The mobile electrical capacitance tomography sensor according to claim 4, characterized in that: The signal transmission line is a double-shielded line consisting of a cable core, an insulating layer and a shielding wire mesh; the outer shielding cover, the shaft end shielding electrode and the interlayer shielding electrode are all connected to the shielding wire mesh; The shielding wire mesh is used to connect to an external grounding wire; The welding area of ​​the extended end of the measuring electrode is welded to the cable core, and the cable core is used to output the signal detected by the measuring electrode.

10. An imaging device, characterized in that: The imaging device comprises: a signal acquisition module, an imaging display module, a high temperature microreactor and a mobile electrical capacitance tomography sensor according to any one of claims 1 to 9; The mobile capacitance tomography sensor is mounted on the outer wall of the fluidizing chamber of the high-temperature microreactor and is in contact with the outer wall of the fluidizing chamber to obtain capacitance data; The signal acquisition module is electrically connected to the mobile electrical capacitance tomography sensor and is used to acquire the electrical capacitance tomography signal acquired by the mobile electrical capacitance tomography sensor; The imaging display module is electrically connected to the signal acquisition module and is used to perform image reconstruction on the capacitance tomography signal acquired by the signal acquisition module.

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