Experimental investigation of the performance of modified expanded graphite powder doped with zinc borate in extinguishing sodium fires |
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| Institution: | 1. School of Safety Science and Engineering, Changzhou University, No. 21, Gehu Mid-Rd., Wujin Dist., Changzhou, 213164, Jiangsu, China;2. School of Materials Science and Engineering, Changzhou University, No. 21, Gehu Mid-Rd., Wujin Dist., Changzhou, 213164, Jiangsu, China;1. Industry School of Standardization, University of Jinan, Jinan, China;2. State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, China;3. Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (CICAEET), Nanjing University of Information Science & Technology, Nanjing, Jiangsu, China;1. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, Jiangsu 221116, People''s Republic of China;2. School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, People''s Republic of China;1. Dipartimento di Ingegneria Industriale, Università degli Studi di Padova, Via Marzolo 9, 35131, Padova, Italy;2. Dipartimento di Ingegneria Civile, Chimica, Ambientale e dei Materiali, Università degli studi di Bologna, Via Terracini 28, 40131, Bologna, Italy;3. Corpo Nazionale dei Vigili del Fuoco Comando Venezia, Via Motorizzazione 7, 37100, Venezia, Italy;4. Dipartimento di Ingegneria Civile, Edile e Ambientale, Via Marzolo 9, 35131, Padova, Italy;1. College of Safety Science and Engineering, Nanjing Tech University, Nanjing, 211816, Jiangsu, PR China;2. Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control, Nanjing Tech University, Nanjing, 211816, Jiangsu, PR China |
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| Abstract: | Sodium is the main cooling medium in the circuit of fourth-generation nuclear reactors, and its leakage constitutes a severe fire hazard because of its high chemical activity. In this study, expandable graphite (EG), which is a traditional sodium fire-extinguishing agent, was modified with zinc borate (ZB) as an intercalator, and the modified EGZB was characterized. Moreover, the effectiveness of the modified EGZB in extinguishing sodium fires was tested using a self-developed fire-extinguishing experimental device. This study's results indicated that EG, EGZB had a smaller particle size, higher thermal stability, higher fire-extinguishing speed, and lower powder mass consumption than EG. During the fire-extinguishing process, ZnO decomposed by ZB captured free radicals and inhibited the combustion reaction. Furthermore, B2O3 was adsorbed on the surface of the EG layer, which strengthened covering and asphyxiation. The findings of this study provide crucial information for effectively controlling fires caused by active metals and metallo-organic compounds. |
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| Keywords: | Fire suppression Expandable graphite powder Sodium fire Fire control mechanism |
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