Device and method for measuring dust emission of graphite dust particles

Abstract

The invention provides a device and a method for measuring the dust emission of graphite dust particles. The device comprises a high-pressure gas injection system, a pipeline electrical heating system, a main loop system, a dust emission testing section and a pressure relieving system. The device can be used for researching the dust emission characteristics of graphite dust at the high temperature under the high pressure and the change of particle size before and after dust emission. Before being injected into a main loop by the high-pressure gas injection system, an air source is heated by a pipeline heating device, and a high-temperature and high-pressure environment is formed in the main loop. The flow speed of the airflow can be continuously adjusted by a frequency modulation fan. The graphite dust particles are deposited on a detachable flat plate suspending in the center of a pipeline. The dust emission amount of the particles can be obtained by measuring the mass change of the flat plate before and after dust emission. The particle samples on the flat plate are collected before and after dust emission, and particle size analysis is carried out on the samples, so that the particle size characteristics of the particles with dust emission can be further obtained under the different working conditions.

Description

technical field [0001] The invention relates to the field of nuclear reactor engineering, in particular to a test method and device for measuring the dusting of graphite dust particles that may be generated in a high-temperature reactor. Background technique [0002] High Temperature Gas Cooled Reactor (High Temperature Gas Cooled Reactor) is a reactor system moderated by graphite and cooled by helium. Compared with other nuclear energy systems, the modular high-temperature gas-cooled reactor has the characteristics of good safety and high power generation efficiency, and has attracted widespread attention from all 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 is the most likely advanced reactor type to be implemented in the near future. During the operation of the pebble bed high temperature gas-cooled reactor test core AVR (1967-1988) developed by Jü...

AI Technical Summary

Problems solved by technology

When the reactor is running under normal conditions, graphite dust particles flow in the primary circuit of the reactor along with the cooling gas helium, and deposit on the surface of the primary circuit and in the flow dead zone, which brings inconvenience to the maintenance and repair of equipment; graphite dust will also Deposition on the surface of the evaporator heat exchange tube affects its heat exchange efficiency, etc. Graphite dust particles have a loose and porous structure, and the surface can absorb radioactive fission fragments

When the reactor is started and shut down, the dust concentration in the reactor can reach 3-5 times that of normal operation; once a breach occurs, a part of the graphite powder that has been deposited on the surface of the primary circuit will leak out, causing radioactive pollution to the surrounding environment

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