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Method referring to determine switching point of switch type passive nucleon material level gage

A material level gauge and switch type technology, which is applied in the field of determining the switch point of the switch type passive nuclear material level gauge, to achieve the effect of improving reliability and increasing selectivity

Inactive Publication Date: 2012-10-03
郭云昌 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For the switch-type passive nuclear material level gauge, the determination of the switch point is the basis for the alarm of material full and material empty, so its accuracy is very critical, but there are few methods for accurately determining the switch point in the prior art

Method used

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  • Method referring to determine switching point of switch type passive nucleon material level gage
  • Method referring to determine switching point of switch type passive nucleon material level gage

Examples

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Effect test

Embodiment 1

[0050] Use the mobile positioning method to determine the switch point of the full-fill alarm of the switch-type ash hopper level gauge. In the system debugging stage, considering the safety, it is not allowed to accumulate ash to the installation position of the level gauge. The specific operation steps are as follows:

[0051] (1) Remove the switch-type ash hopper level gauge from the installation position, and move it under the installation position to monitor the ash hopper;

[0052] (2) When there is no fly ash in the ash hopper, the gamma ray intensity values ​​measured at each height are basically the same;

[0053] (3) When the amount of fly ash in the ash hopper increases, the gamma ray intensity value measured by the level gauge in the lower area with fly ash or close to the area with fly ash is greater than the gamma ray intensity value in the upper area without fly ash;

[0054] (4) With the increase of fly ash, the material level of the ash hopper rises, and the ...

Embodiment 2

[0059] The warehouse pump or pneumatic conveying tank is used to convey the fly ash accumulated in the ash hopper. The working conditions require that the fly ash is full to 2 / 3 or 3 / 4, and the alarm is released when the fly ash is completely emptied. Considering the climate in the south, the steel outer wall of the warehouse pump is directly exposed to the outside, and the height of the ash inside can be determined by the knocking method, which is the height of the material level. The mobile positioning method is another method used in this paper when the material level cannot be determined to be higher than the set position. method, so the direct hysteresis method can be used to determine the full-fill alarm point and full-fill alarm release point of the switch-type warehouse pump level gauge, including the following steps:

[0060] (1) Install the switch-type warehouse pump material level gauge at the selected position. When there is no ash in the warehouse pump, measure the...

Embodiment 3

[0064] Usually the ash hoppers in the third and fourth electric fields have a very small amount of ash falling, and it is difficult to have a chance of ash accumulation in a short period of time. However, these ash hoppers are very close to the ash hoppers of the first and second electric fields. The determined switch point is used for reference as the full-fill alarm point and full-fill alarm release point.

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Abstract

The invention relates to the technical field of passive nucleon material level measurement, in particular to a method referring to determine a switching point of a switch type passive nucleon material level gage. The method comprises the following steps of: installing the switch type passive nucleon material level gage on a selected position; determining that a material level reaches a preset position, and measuring a gamma ray to obtain a counting rate mean value Nh; determining that the material level is lower than the preset position, and measuring the gamma ray to obtain a counting rate mean value Nl; when Nh>Nl and a measured value> / =Nh, sending full material alarm; when the measured value< / =Nl, eliminating the full material alarm; when Nh<Nl and the measured value< / =Nh, sending the full material alarm; and when the measured value> / =Nl, eliminating the full material alarm. The method provided by the invention is suitable for determining the switching point of the switch type passive nucleon material level gage, provides a foundation for accurately sending full and empty material alarm, increases the selection of users according to actual measurement conditions during measurement through three methods, i.e. a direct return difference method, a motion positioning method and a reference positioning method which can be mutually replaced according to the actual measurement conditions, and can also enhance the data reliability as an inspection method.

Description

[technical field] [0001] The invention relates to the technical field of passive nuclear material level measurement, in particular to a method for determining the switching point of a switch-type passive nuclear material level gauge. [Background technique] [0002] In chemical industry, metallurgy, coal, electric power and other industries, in the process of conveying materials, it is often necessary to measure the material level in hoppers and silos. [0003] There are mainly two existing methods for measuring material level by using gamma rays: one is a traditional nuclear material level gauge with a radioactive source, such as an automatic material level control device disclosed in the domestic patent CN202230393. The symmetrical gamma ray column measures the material level in the level bin; the other is a non-radioactive nuclear level gauge that uses the natural gamma rays of the measured material and the environment to measure the material level without a radioactive so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F25/00
CPCG01F23/288G01F25/00G01F23/802G01F25/20
Inventor 郭云昌朱敏娟
Owner 郭云昌
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