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A thickness detection device and method based on a semi-cylindrical shell capacitor
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A thickness detection and capacitor technology, applied in electromagnetic measurement devices, electric/magnetic thickness measurement, etc., can solve problems such as shortening machine life, secondary dust rapping, and increasing industrial costs, achieving low cost, effective detection, and convenient operation. Effect
Active Publication Date: 2021-05-25
JIANGSU UNIV
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Problems solved by technology
Since the fixed rapping frequency cannot adapt to various conditions, it often causes secondary dust or insufficient rapping, which shortens the life of the machine and increases the industrial cost
Method used
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Embodiment 1
[0070] like Figure 4 As shown, when the object to be detected is dust, the detection method of the thickness detection device based on a semi-cylindrical shell capacitor comprises the following steps:
[0071] When not detecting, the outer pole plate 7 and the inner pole plate 9 are bonded together;
[0072] When it is desired to detect the dust deposition thickness, the stepper motor works to drive the inner pole plate 9 to rotate at a certain angle, so that the outer pole plate 7 and the inner pole plate 9 are opposite;
[0073] Obtain the dielectric constant of the dust-air mixture and the dielectric constant of the deposited dust at the current temperature through the upper compensation plate 1 and the lower compensation plate 4, as the dielectric constant reference of the middle working plate 3 for dust thickness measurement. The medium of the upper compensating plate 1 is air and dust mixture. Since the distance between the plates, the relative area and the capacitance...
Embodiment 2
[0096] The object to be tested in this embodiment 2 is particulate matter. The difference between this embodiment 2 and embodiment 1 is that the thickness detection formula of the particulate matter is:
[0097]
[0098] h 颗粒物 =H 装 +l 颗粒物2 +l 颗粒物 formula sixteen
[0099] In the formula, l 颗粒物2 and l 气2 is the value to be measured, l 颗粒物2 is the height of particles in the middle plate, l 气2 is the air height in the middle plate, C 总 、C 上 、C 下 is the measured value, l 气 is the height of the upper compensating pole plate 1, the upper compensating pole, 1 is completely filled with the gas inside the device, l 颗粒物 For the height of the lower compensating pole plate 4, the lower compensating pole plate is completely filled with particles.
Embodiment 3
[0101] The object to be tested in this embodiment 2 is a liquid, and the difference between this embodiment 3 and embodiments 1 and 2 is that the thickness detection formula of the liquid is:
[0102]
[0103] h 液体 =H 装 +l 液体2 +l 液体 formula eighteen
[0104] where l 液体2 and c is the value to be measured, l 液体2 is the liquid height in the middle plate, l 液体2 is the air height inside the middle plate, C 总 、C 上 、C 下 is the measured value, l 气 is the height of the upper compensating pole plate 1, the upper compensating pole, 1 is completely filled with the gas inside the device, l 液体 For the height of the lower compensation plate 4 , the lower compensation plate is completely filled with liquid.
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Abstract
The invention provides a thickness detection device and method based on a semi-cylindrical shell capacitor, including a semi-cylindrical shell capacitor, a base, a sensor and a controller; a semi-cylindrical shell capacitor including an outer pole plate and an inner pole plate; an outer pole plate and an inner pole plate From top to bottom, it includes the upper compensation plate, the middle working plate and the lower compensation plate; the base includes a nested outer ring and an inner ring, and the upper part of the inner ring is connected to the lower compensation plate of the inner plate. , the inner ring is connected to the driving device, the upper part of the outer ring is connected to the lower compensation plate of the outer plate; the controller is respectively connected to the upper compensation plate, the middle working plate, the lower compensation plate, the sensor and the driving device. The invention can adapt to the changeable environment of industrial chimneys, adopts the double compensation method of upper and lower plates, can accurately, quickly and effectively detect the thickness of dust deposition, and is suitable for the detection of particle and liquid thickness.
Description
technical field [0001] The invention belongs to the field of material thickness detection, and in particular relates to a thickness detection device and method based on a semi-cylindrical shell capacitor. Background technique [0002] Industrial dust removal is suitable for various thermal power stations, chemical plants and other large chimney factories that require electrostatic dust removal. The electrostatic dust removal device is equipped with dust thickness detection, which can adjust the dust removal frequency more accurately, effectively and flexibly, increase the life of the electrostatic precipitator, save resources, and at the same time Environmental pollution caused by secondary dust is avoided. [0003] It is a common method to use capacitance to detect the thickness of dust or the height of liquid. For example, the invention patent CN109186713A discloses a capacitive sensor and a liquid height detection system, which includes a capacitive sensor, a sensor dete...
Claims
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