External ball passage detecting method and device for ball-bed high temperature gas cooled reactor

Abstract

The invention relates to external ball passage detecting method and device for a ball-bed high temperature gas cooled reactor, which belong to the technical field of fuel element detection of the ball-bed high temperature gas cooled reactor. The method is characterized by comprising the following steps of: inducing the pass of balls by two self induction coils in a resonance bridge detecting circuit, and outputting sinusoidal alternating voltage delta U; sequentially amplifying, rectifying and filtering the sinusoidal alternating voltage delta U by a signal processing circuit, then extracting a ball passing waveform UO, and outputting a wave crest pulse UP1 and a wave trough pulse UP2 after passing through a comparator; and inputting the data into a singlechip, and judging whether a ball passes according to conditions, wherein the resonance bridge detecting circuit comprises the two self induction coils, two oppositely installed semicircular columns surrounding at the outer side of a pipeline are used as the frameworks of the self induction coils, two semicircular coils are respectively up and down wound on the framework at each side, the two semicircular coils on the same plane of the frameworks at both sides are used as a group, and each group is equivalent to a single circular coil through external connection. The detecting device has the advantages of simple structure, high accuracy, good reliability and the like.

Description

Technical field: [0001] The invention belongs to the technical field of high temperature gas-cooled reactor fuel element detection. Background technique: [0002] Rational development of nuclear energy is an economical and effective way to alleviate the world energy crisis. The pebble bed high-temperature gas-cooled reactor is an advanced "fourth-generation nuclear reactor type", which has the advantages of high power generation efficiency, good inherent safety, and the ability to load and unload fuel without stopping the reactor, and has been highly valued by many countries . The pebble bed high-temperature gas-cooled reactors that have been built in the world include Germany's AVR reactor and THTR reactor, China's HTR-10 high-temperature gas-cooled experimental reactor, South Africa's PBMR reactor under construction, and my country's 200MW demonstration reactor. [0003] There are several types of fuel element detection devices currently used in the pebble bed stack (all...

AI Technical Summary

Problems solved by technology

[0007] (1) The structure of the mutual inductance sensor with the externally attached design is special, including two sets of detection coils and a set of wide excitation coils wound in the concave type. The process of winding the concave coils is complicated, and the sensor production is difficult;

[0008](2) The signal obtained by the detection circuit is very weak, and the subsequent signal processing circuit has a high amplification factor, which is easy to introduce interference noise and affect system stability

[0009](3) Due to the obvious interference waveform, it is necessary to increase the complexity of the MCU program to improve its waveform recognition ability, and the complexity of the program structure is not good for the reliability of the software

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