Device and method for measuring concentration of graphite dust in primary loop pipeline of high temperature gas cooled reactor

Abstract

The invention provides a device and a method for measuring the concentration of graphite dust in a primary loop pipeline of a high temperature gas cooled reactor. The device comprises a sampling tube, a dust collecting chamber and a gas storage tank, wherein a gas inlet of the sampling tube is formed in the primary loop pipeline, a gas outlet of the sampling tube is connected with the dust collecting chamber, and the dust collecting chamber is connected with the gas storage tank through a pipeline. The whole device overcomes the thermal gradient sedimentation, does not use a differential pressure sensor or a flow meter, and is simple in structure, stable in performance and convenient to maintain. In the collecting process, high pressure gas flow containing the graphite dust in the high temperature gas cooled reactor can flow through the sampling tube and the dust collecting chamber, wherein the graphite dust can be intercepted by a dust collecting net in the dust collecting chamber, and the high pressure gas flow can be stored in the gas storage tank. By measuring the mass of the graphite dust intercepted in the dust collecting chamber and the amount of the gas collected in the gas storage tank, the concentration of the graphite dust in the primary loop pipeline of the high temperature gas cooled reactor can be calculated.

Description

technical field [0001] The invention relates to a device and a method for measuring the concentration of graphite dust in a primary circuit pipeline of a high-temperature gas-cooled reactor, belonging to the technical field of nuclear reactor engineering. Background technique [0002] High-temperature gas-cooled reactor (HTGR) uses graphite as the structural material and helium as the coolant. It has high inherent safety characteristics and is one of the fourth-generation advanced reactor types recognized internationally. Compared with other nuclear energy systems, the design of modern high-temperature gas-cooled reactors has obvious safety advantages in safety accidents such as loss of cooling. These advantages are mainly due to the large negative reactivity temperature coefficient of fuel and moderator in HTGR reactors, and there is a considerable margin between the maximum temperature of the combustion element and its allowable temperature limit under normal conditions ,...

AI Technical Summary

Problems solved by technology

However, the inventors have found through precise experiments that for the high-temperature helium in the primary circuit of a high-temperature gas-cooled reactor, if the cooling process is performed in the sampling pipe, a large temperature gradient will be formed in the sampling pipe, which will produce a gradient Deposition, so that part of the graphite dust in the collected airflow is deposited in the sampling tube, thus making the measurement results inaccurate

Moreover, due to the limited volume of the traditional sampling tube, the sampling of high-pressure gas is limited, or the sampling time is too long, resulting in changes in the sample environment, which will also bring large measurement errors

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