Abstract
A large number of carbon materials are adopted in high-temperature gas-cooled reactor (HTGR). These carbon materials mainly include graphite IG-110 and boron-containing carbon material (BC), both of which are typical porous materials and normally absorb moisture. In order to inhibit the chemical corrosion reaction between core internals materials and moisture, the core needs to be strictly dehumidified before the reactor is put into operation. This paper mainly analyzed the moisture transfer mechanism in these carbon materials. Moisture transfer models were developed, and the dehumidification process of HTR-PM core was simulated. In addition, the influence of working temperature and system pressure on dehumidification was studied as well.
Highlights
Due to the excellent comprehensive performance of carbon materials, they have been extensively adopted in hightemperature gas-cooled reactor (HTGR), serving as structural material, fuel matrix material, etc. [1,2,3]
These carbon materials used in HTGR typically include isostatic pressure graphite IG-110 and boron-containing carbon material (BC) [4]
Graphite IG-110 mainly serves as fuel matrix material, neutron reflecting layer, and other reactor core internals, while for BC, since it contains boron, which has a big neutron absorption cross section, it is made into the shielding layer [5]
Summary
Due to the excellent comprehensive performance of carbon materials, they have been extensively adopted in hightemperature gas-cooled reactor (HTGR), serving as structural material, fuel matrix material, etc. [1,2,3]. The pore structures and molecule groups attached on the surface of pores result in strong moisture absorption capacity [8, 9] Other impurities, such as H2O, O2, and CO2, can be absorbed by carbon materials as well. Due to the high temperature, moisture absorbed in the carbon internals of reactor core will be released and carried away by flowing helium. Dry helium will return to the reactor core This circulation of helium flow described above will gradually decrease the moisture content in the carbon internals. Dehumidification process mainly includes moisture transfer in carbon materials, moisture transfer in helium flow, and the condensation and separation of moisture. During dehumidification and purification process of reactor core, mass transfer in carbon material is considered as the dominating factor.
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