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Kinetics mechanism of spontaneous combustion of oil tank containing sulfur caused by Fe(OH)3 |
ZHAO Sheng-ping1,JIANG Jun-cheng1,WANG Wei-ning2
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(1.College of Urban Construction and Safety Engineering in Nanjing University of Technology,Nanjing 210009, China;2. Faculty of Social Sciences,Kunming University of Science and Technology, Kunming 650093, China)
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Abstract: |
The main cause of the spontaneous combustion of oil storage tank containing sulfur is that the corrupt products of tank has some oxidation tendency, and they can induce the oil spontaneous combustion when they are self-igniting. The one of corrupt products of tank, the sulfurized product of Fe( 0H)3, was simulated by the su丨furation equipment Then the thermal analysis experiment was done. And the kinetic mechanisms of the corrupt products of Fe( 0H)3 were studied by using the model-free method and master plots. The results show that the thermal gravimetric (TG) plot of the sulfurized product of Fe (0H)3 includes two stages of mass loss. The first oxidative reaction is up to the nucleation and nucleus growth mechanism and the kinetic model function is g{a)- [-ln( 1-a) ]a6731,the activated energy is 124.25 kj/mol and the pre-exponential factor is equal to 4.45x1013 s 1. The second oxidative reaction accords with the phase boundary reaction mechanism and the kinetic model function is g( a) = 1—( 1 —o) ,the activated energy is 218.42 kj/mol and the pre-exponential factor is equal to 1.07xl08 s'1. |
Key words: safety engineering sulfurized product of Fe(0H)3 spontaneous combustion model-free method master plots method kinetics |
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