The acidic iron ion content in the reflux tank of the continuous reforming pretreatment stripping unit is high
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Continuous reforming, pretreatment stripping column reflux tank – what are the reasons for the high content of iron ions in acidic water? What are the control measures?
The crude oil has a high sulfur content, which reduces the efficiency of the catalyst in the dechlorination reactor; furthermore, the stripping tower was not filled with corrosion inhibitors as required. If the pretreatment involves fractional distillation followed by hydrogenation, it is necessary to properly control the dehydration process in the pre-fractionation tower ； For the pretreatment process of hydrogenation followed by distillation, it is necessary to strictly control the amount of corrosion inhibitor added
The hydrodesulfurization reaction produces hydrogen sulfide, and the overhead of the stripping tower contains acidic substances with hydrogen sulfide. Therefore, a corrosion inhibitor should be added to the overhead distillation line to protect the pipeline equipment. If the iron ion level is high, it indicates increased pipeline corrosion, and it is necessary to increase the amount of corrosion inhibitor added
The CNPC anti-corrosion guidelines stipulate that the iron ion content should be less than 3 ppm; otherwise, an inspection is required to verify the anti-corrosion measures in place.
A high iron ion content indicates corrosion; it is necessary to determine which factor, ranging from the raw materials to the operating conditions and the addition of additives, is at fault, so that appropriate measures can be taken