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Analysis on Advantages and Disadvantages of Iron Sulfides in Sour Gas Treatment
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Key Words:Sour gas; Treatment; Iron sulfide; Advantage and disadvantage
Abstract:In order to reduce corrosion of iron sulfides on amine plant in sour gas treatment, it is necessary to make clear relative corrosion mechanism and recognize the conditions that affect corrosion severity. Amine plants treating gas containing H2S will have iron sulfides in the system. FeS is the reaction product of iron (Fe) and sulfur (S) in the absence of oxygen. More especially to amine systems, this reaction is between iron and H2S. This initial reaction is a form of metal corrosion; however, under ideal conditions the FeS formed then “sticks” to the walls of piping and vessel internals and acts as a protective film thus retarding further metal corrosion. Once the FeS scale is compromised, the chance of developing a galvanic-type corrosion cell is increased. Weaker scales are also easily removed or subject to delamination, allowing for the potential ingress of CO2 under the deposit and the subsequent aggressive under-deposit corrosion. Chemical cleaning, in general, is the most effective method of FeS removal. So, removal of those compromised iron sulfides out from the amine system is very important.
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