Device and method for analyzing heavy suspension rules of graphite dust in high-temperature heap breach accident

Abstract

The invention provides a device and a method for analyzing heavy suspension rules of graphite dust in a high-temperature heap breach accident. The device comprises a high-pressure gas cylinder, a high-pressure air storage system, an electromagnetic valve, a flow meter, a discharge pipeline, a dust deposition wall surface, a stop valve, a sonic nozzle, a vacuum tank, and a vacuum pump. The device simulates the sound emission of a high-temperature heap breach through the sonic nozzle; the wall surface on which the graphite dust is deposited is arranged inside the discharge pipeline; high-pressure gas flow in the high-pressure air storage system is discharged into the vacuum tank via the sonic nozzle through the discharge pipeline under the differential pressure effects of the high-pressure air storage system and the vacuum tank in measurement; the deposited graphite dust in the discharge pipeline generates heavy suspension in the process. Thus, the heavy suspension rules of the graphite dust in the discharge process can be detected.

Description

technical field [0001] The invention relates to an experimental device and a test method for analyzing the law of resuspension of graphite dust deposited on a pipeline wall surface when a breach accident occurs in a high-temperature gas-cooled reactor, and belongs to the technical field of nuclear reactor engineering. Background technique [0002] The modular high-temperature gas-cooled reactor has the characteristics of good safety and high power generation efficiency, and has attracted widespread attention from various countries. The ultra-high temperature gas-cooled reactor is one of the candidate reactor types for the fourth-generation advanced nuclear energy system, and is considered to be the most likely to be implemented in the future. Advanced stack type. In a high-temperature gas-cooled reactor, except for a small amount of fuel and control materials, the core is basically made of graphite materials, and the unique fuel ball circulation mode of the pebble bed reacto...

AI Technical Summary

Problems solved by technology

[0003] During the movement of graphite dust, part of it will be deposited on the wall of the primary circuit of the high-temperature reactor. When a serious accident occurs, such as a breach accident, the high-pressure gas in the primary circuit of the reactor will be ejected from the breach, causing The pressure drops sharply, which causes the helium flow velocity in the primary circuit to change drastically, which may raise the deposited dust, follow the helium flow, and discharge the reactor with the vented airflow, thereby causing harm to the surrounding environment

Images