Helium purification and helium auxiliary system is one of important systems guaranteeing the safe operation of high-temperature gas-cooled reactor. In this system, wire mesh mist eliminator is one of the key components and used to separate waste water containing tritium, and remove moisture after reactor accident. Base on the ideal fluid model and packing pad model developing by Carpenter, A calculation model is presented for separation efficiency of mist eliminator. The calculation program “SEP-WMME” is developed based on the model. The calculation results fit well with experiment results. Theoretic analysis is carried out for the mist eliminator of HTR-PM helium purification system engineering validation test loop. The analysis shows the inlet velocity is an important parameter for mist eliminator. When the inlet velocity is above 3.0m/s, high separation efficiency will be obtained.

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