Method of reducing corrosion and corrosion byproduct deposition in a crude unit

摘要

A method of optimizing system parameters in a crude unit to reduce corrosion and corrosion byproduct deposition in the crude unit is disclosed and claimed. The method includes measuring or predicting properties associated with the system parameters and using an automated controller to analyze the properties to cause adjustments in the chemical program to optimize the system parameters. Adjusting the system parameters effectively controls corrosion in the crude unit by reducing the corrosiveness of a fluid in the process stream and/or by protecting the system from a potentially corrosive substance. System parameter sensing probes are arranged at one or more locations in the process stream to allow accurate monitoring of the system parameters in the crude unit.

主权项

1. A method of optimizing a system parameter in a process stream of a crude unit, the method comprising:
(a) introducing an opportunity crude oil into a crude unit that previously contained a different kind of crude oil, the properties of the opportunity crude differing such from the previous crude oil that it disrupts the steady state of the unit including causing a corrosion inducing spike in chloride concentration, (b) measuring and/or predicting a property associated with the system parameter at one or more points in the crude unit; (c) determining an optimum range associated with the measured and/or predicted property; (d) if the measured and/or predicted property is outside of the optimum range associated with that property, causing a change in an influx of a composition into the process stream, the composition capable of adjusting the property associated with the system parameter in a manner to bring the measured and/or predicted property within said optimum range; provided that adjustments are limited to no more than one per 30 minutes and if there are either four overall adjustments or the adjustment results in a change of at least 50% of added composition then further influx of composition suspended for 4 hours; and (e) optionally repeating steps (b) to (d) for a plurality of different system parameters, each different system parameter having a unique associated propertywherein the measuring/or predicting property comprises the steps of: collecting a sample of fluid from a process stream to form a sample stream; adding a sulfide scavenger obtained by reacting morpholine with formaldehyde to the sample stream; passing the sample stream through a membrane that prevents a reaction product of the sulfide scavenger and sulfide from flowing therethrough; and allowing the sample stream that flows through the membrane to contact a chloride specific electrode of a measurement cell to measure chloride content.