Experimental investigation on oxidation of sulfurized rust in oil tank |
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| Institution: | 1. College of Chemical Engineering, China University of Petroleum(East China), Qingdao, Shandong 266580, China;2. College of Mechanical and Electronic Engineering, China University of Petroleum(East China), Qingdao, Shandong 266580, China;3. State Grid Anhui Electric Power Research Institute, Hefei, Anhui, 230 022, China;1. School of Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, China;2. Center for Offshore Engineering and Safety Technology, China University of Petroleum (East China), Qingdao 266580, China;1. Center for Offshore Engineering and Safety Technology, China University of Petroleum (East China), Qingdao, 266580, China;2. College of Chemical Engineering, China University of Petroleum (East China), Qingdao, 266580, China;3. Centre for Risk, Integrity and Safety Engineering (C-RISE), Memorial University, St John''s, NL, A1B 3X5, Canada;1. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, PR China;2. Department of Materials Science & Engineering, University of Science and Technology of China, Hefei 230026, PR China;1. Center for Offshore Engineering and Safety Technology, China University of Petroleum, Qingdao, 266580, PR China;2. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, 257061, PR China;3. Department of Environment and Safety Engineering, China University of Petroleum, Qingdao, 266580, PR China |
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| Abstract: | Oxidation of sulfurized rust in oil tank is complicated, and it is influenced by numerous factors such as water content, air humidity, operating temperature etc. The paper focuses on the oxidation process of sulfurized rust in the wild. Firstly, samples collected from a petrochemical company were put into the sulfurization & oxidation experimental apparatus to gain wet and dry sulfurized rusts. Their chemical compositions and phase were analyzed by Energy Dispersive X-ray Spectrometer (EDS) -scanning electron microscope (SEM) technique. The results showed that both wet and dry sulfurized rusts had S, Fe2O3, Fe3S4 and FeS2, whereas FeS only existed in wet sulfurized rust. The two kinds of rusts gave a short length of side, diamond appearance and a large pore size in structure. Then oxidation of wet sulfurized rust was investigated, which included electrochemical reaction stage, electrochemical & chemical reaction coexisting stage and chemical reaction stage. The final oxidation product of wet sulfurized was determined to be Fe2O3. On the basis of this study, an indicator for monitoring and early-warning was proposed to prevent plants in vicinity of the accidental vessel or tank from fire and explosion. |
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| Keywords: | Oil tank Sulfurized rust Oxidation process Chemical reaction Electrochemical reaction Indicator for monitoring and early-warning |
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