<p>There are a lot of graphite materials in HTGR. Graphite is a kind of porous medium, the pore will absorb water and other impurities. Under the high temperature condition of high temperature gas cooled reactor, graphite will react with these impurities. Through the long-term corrosion effect, the graphite material in the reactor will be greatly damaged. Therefore, in order to reduce the corrosion of impurities on graphite materials and ensure the safe operation of the reactor. Before the operation of HTR, the core of HTR must be &nbsp;&nbsp;dehumidified. In this experiment, the original laboratory equipment is transformed into a large sample thermogravimetric analysis device. The improved equipment can broaden the volume and mass range of samples in thermogravimetric experiment, which makes the equipment can be used for the analysis and research of larger sample materials. The relationship between temperature and mass of carbon material is detected by thermogravimetry, and the curve of mass versus temperature is obtained under program control. The adsorption and desorption rates of the same carbon materials at different temperatures is obtained. Based on the analysis of the experimental results, the principle of water migration in graphite is determined. The moisture diffusion model of graphite dehumidification is established. The model is used to simulate the dehumidification of HTR graphite structure. The water migration process in HTR is obtained. Then the dehumidification time is predicted and the influence of specific temperature on the whole dehumidification process is clarified.</p>

Study on Dehumidification of Carbon Materials Based on Thermogravimetry

Paper Proceedings: https://asmedigitalcollection.asme.org/ICONE/ICONE28/volume/85246

2021 28th International Conference on Nuclear Engineering (ICONE28)

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