Loss mechanism and lifetime estimation of Ce–W cathode in high temperature thermionic emission electrostatic precipitation |
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| Institution: | 1. School of Energy and Environment, Southeast University, Nanjing 210096, PR China;2. School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210042, PR China;3. School of Material Science and Engineering, Beijing University of Technology, Beijing 100022, PR China;1. School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China;2. School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA;1. Department of Mechanical Engineering, Sharif University of Technology, Tehran, Iran;2. Department of Mechanical Engineering, University of Tabriz, Tabriz, Iran;3. Department of Energy Systems Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran;1. University of Rome “Tor Vergata”, Department of Electronic Engineering, Via del Politecnico 1, Roma, 00133, Italy;2. Istituto Nazionale di Fisica Nucleare – Laboratori Nazionali di Frascati, Via E. Fermi 40, Frascati Roma, 00044, Italy;3. Ariel University, Department of Electrical and Electronic Engineering, Kiriyat Ha-Mada, 40700, Ariel, Israel |
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| Abstract: | Rare earth tungsten, 2.2% cerium–tungsten (Ce–W), was used as emission cathode material in thermionic emission electrostatic precipitation. The microstructures and emission properties were investigated. A model was established to estimate cathode lifetime in high temperature and oxygen-bearing atmosphere. Results show that there were not great changes in the inner microstructure of emission materials. But on the surface, tungsten was oxidized to tungsten trioxide and then tungsten trioxide and rare earth oxides evaporated and lost. Decrease of oxygen concentration was effective to prolong operation time of cathode. The increase of temperature reduced cathode lifetime remarkably. |
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| Keywords: | Electrostatic precipitation Cerium–tungsten Microstructural change Emission characteristics Cathode lifetime |
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