A kind of particle charging device and method

Abstract

The invention provides a particle charging device. The particle charging device comprises a charging device, a spherical valve and a gate valve, wherein the charging device comprises a spiral rod, a cylindrical charging barrel, a tapered charging barrel, a discharging pipe and a spherical sealing end head. The invention further provides a charging method realized by the device disclosed by the invention. According to the particle charging device and method disclosed by the invention, high-density particles can be added at a high-temperature state, so that the particles can be normally sprayed and fluidized at the beginning of adding, the adverse effects caused by accumulation of the high-density particles, which are not easily fluidized at a room temperature, on the bottom of a reactor are avoided, the possibility of spraying out of high-temperature gas and splashing down of the particles is avoided, and the requirements of large-scale production in the future are met.

Description

technical field [0001] The invention belongs to the field of equipment manufacturing, in particular to a particle charging device and a charging method. Background technique [0002] The nuclear fuel used in my country's pebble bed high-temperature gas-cooled reactor is a ceramic fuel element with a diameter of 6 cm, and the structure is spherical coated particles (TRISO) dispersed in the graphite matrix of the fuel area. The first guarantee for the inherent safety of the high-temperature gas-cooled reactor nuclear power plant is that the nuclear fuel used is TRISO-type coated particles, which are produced by UO 2 It consists of nuclear fuel core particles, loose pyrolytic carbon layer, inner dense pyrolytic carbon layer, silicon carbide layer and outer dense pyrolytic carbon layer. The nuclear fuel particles with a four-layer composite structure are prepared by chemical vapor deposition in a spouted bed, and a certain amount of UO 2 The nuclear fuel core is loaded into th...

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Problems solved by technology

[0003] Because UO 2 The density of the nuclear fuel core is very high (10.8g / cm3), and it is difficult to spray and fluidize it at room temperature, so the conventional feeding method cannot be used, that is, the fluidization gas is introduced first, and then UO is added. 2 The core particles are then heated in the reactor such that UO 2 The core particles cannot be normally fluidized at low temperature, and will accumulate at the bottom of the reactor for a long time, causing adverse consequences such as uneven heating

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