Title: On spontaneous combustion characteristics of the iron sulfides in oil tanks containing sulfur
Abstract: This paper is aimed at introducing the authors' research of the spontaneous combustion characteristics of iron sulfides as a result of the reactions of hydrogen sulfide to the different degrees of humidity of the iron oxide black, iron oxide red and the iron hydroxide. The sulfuration reactions may last about six hours with the spontaneous combustion characteristics of resultants showing quite obvious discrepancy. As is shown in our experiments, the resultant product formed by the reaction of hydrogen sulfide with dry iron oxide red proves to be the residue left over by the air oxidization at the flow rate of 300 mL/min with its highest temperature of reaction up to 256 ℃. The average temperature-rising speed can be as quickly as 10.8 ℃/min. In addition, the resultants can be formulated as a result of hydrogen reacting to sulfide at 5%, 10% and 15% with the relative humidity of iron oxide red oxidized by the air at the flowing rate of 300 mL/min. with its highest temperature of the oxidation reactions getting to 474 ℃, 408 ℃ and 388 ℃ respectively. The results show that it is possible to distinguish the spontaneous combustion of iron sulfides formed at different degrees of relative humidity from its combustion with other different materials. The experimental results of ours show that the relative humidity of the samples can play a very important role in the oxidation tendency of iron sulfides. When analyzing the iron sulfides formed from different dry iron oxides by TEM, we can find that the compounds of iron sulfides are various in their composition, which may lead to different spontaneous combustion features. However, our experiments prove that the exothermic oxidation of iron sulfides is the chief factor leading to the tank fire and explosion.
Publication Year: 2007
Publication Date: 2007-01-01
Language: en
Type: article
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