Study on Hydrogen Removal Efficiency of Hydrogen Recombiners in Nuclear Power Plant Radioactive Waste Gas Treatment System
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Abstract
Aiming at the hydrogen removal efficiency issue of hydrogen-oxygen recombiners in the radioactive waste gas treatment system of nuclear power plants, this study conducted screening of three platinum-based catalysts and performed experiments on the effects of different process conditions on hydrogen removal performance. The results showed that catalyst 1# exhibited good catalytic activity and stability during continuous operation. After irradiation and the introduction of impurity iodine, the minimum full conversion temperature increased by 2–5 °C, and the activity recovery rate after heating and reduction regeneration reached over 90%. Under reaction conditions at 50 °C, 100 °C, and 150 °C, the limiting space velocity could reach 8000 h-1, 52000 h-1, and 96000 h-1, respectively. The comprehensive screening identified a Pt composite catalyst, which demonstrated excellent low-temperature ignition activity at room temperature and could resist the impact of impurities and water vapor in the gas on the catalytic effect. For the inlet gas hydrogen concentration in the range of 1% to 3%, the outlet hydrogen concentration could be below 3000 ppm under experimental conditions, meeting the requirements for long-term operation of the waste gas treatment system in nuclear power plants.
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