Analysis, Control And Prevention Of Corrosion In The Pre-process System Of Continuous Reforming

CCR unit as one of the core unit in Ningxia petrochemical company refinery, the main task of atmospheric straight-run naphtha oil and diesel oil hydrogenation after catalytic reforming of naphtha, gasoline components generate RONC-100 high octane gasoline, for the plant to produce high grade gasoline blend composition, and produced a large number of hydrogen for hydrogen hydrogenation of plant devices. In recent years, some oil fields in order to increase production, widely used in the production process of some chemical additives to increase crude oil production rate, many of these additives containing chloride chloro-alkanes alkenes or material, hard to dissolve in water, good thermal stability, through desalination method of removal. Pretreatment of raw materials which makes reforming oil organic chlorides content far exceeding design specifications, organochlorines through hydrogenation into hydrogen chloride, cooled with water to form hydrochloric acid, forming acidic corrosion under certain conditions, on the other hand hydrogenation reactions also produce hydrogen sulfide, interaction between the two, resulting in increased corrosion rate. End of 2011 plant starts short time due to severe corrosion has led to restructuring pretreatment system of a number of air cooled heat exchanger leak, pump damage, forced many unplanned shutdown, there is even a pipeline burst, on stable operation and employee safety devices pose a serious threat.Reformer pretreatment system the universality and the seriousness of this Ningxia petrochemical company refinery reformer pretreatment system of corrosion current situation and cause analysis of chlorine corrosion problems and propose reasonable technical and operational program. Through additional off chlorine reactor, transformation Tower sustained corrosion agent injected system, introduced advanced of corrosion online monitoring system, in pre added hydrogen reaction part note ammonia injection, on easy corrosion parts of equipment and pipeline for material upgrade, series corrosion control measures of implementation, makes restructuring device pretreatment system of corrosion get effective control, greatly of reduced has device non-plans shutdown times, save has large equipment check maintenance costs, reduce has tank district gasoline harmonic pressure, achieved has device benefits maximize, for company safe and stable production provides a strong guarantee.