Method of reducing corrosion in a crude unit

A crude oil distillation, system parameter technology, applied in the direction of corrosion prevention during distillation, distillation control/regulation of hydrocarbon oil, measurement devices, etc., can solve the problem that refiners have not adopted unique and effective online equipment process chemistry procedures, have not been successful, etc. problems, to achieve the effect of rapid stabilization of operating parameters, reduction of unqualified oil processing, and optimization of efficiency

Active Publication Date: 2011-09-28
NALCO CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Refiners have yet to adopt more unique and effective on-line equipment for process chemistry programs due to the lack of success in the industry with on-line pH testing and other monitoring

Method used

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  • Method of reducing corrosion in a crude unit
  • Method of reducing corrosion in a crude unit
  • Method of reducing corrosion in a crude unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] An exemplary embodiment of the invention consists of a cluster of on-line analyzers within an explosion proof enclosure that receives a water sample from a dew point water sampling device. The data generated by these analyzers can be appropriately conditioned to deliver control signals to the various process chemical injection pumps. A programmable logic controller (PLC), programmed by one skilled in the art, would convert the raw data into pump control signals. A typical system includes one or more of the following components: Chloride Analyzer; Iron Analyzer; Corrosion Rate Monitor; Conductivity Meter; pH Meter; Dew Point Water Sampling Device; PLC for output; logic programming to convert chloride, pH, and iron data into pump speed control; and wireless or hardwired connection from PLC to pump.

Embodiment 2

[0063] The present invention will provide improvements in the control of each of the three test parameters (chloride ion concentration, pH, and iron ion concentration). Of these three parameters, chloride ions usually cause the most damage if not properly controlled. Figure 6 Shows how the present invention improves control of chloride ion concentration (dotted line indicates optimal concentration). A similar concept of better control by the method of the present invention can be applied to pH, iron ion concentration, and other system parameters, ultimately resulting in reduced corrosion rates from previous levels, extending equipment life.

[0064] Figure 6 Shows many peaks of chloride ion concentration above the upper control limit for actual data from a crude distillation unit. Chloride peaks were destructive to equipment, and retrospective inspection of the data revealed increased corrosion and fouling in the process. Such peaks are more frequent and more damaging whe...

Embodiment 3

[0066] Figure 7 The pH and chloride ion concentration values ​​of the actual crude distillation unit are shown as a function of time (the dotted line indicates the optimal concentration). It can be seen that the decrease in pH is usually accompanied by an upward peak in chloride ion concentration. This decrease in pH generally results in increased corrosion and fouling of heat exchange equipment (due to corrosion by-products). The portion of the figure labeled "Exercise Control" shows that the method of the present invention can be used to stabilize chloride ion concentration and pH, thereby reducing corrosion and fouling in the system. The smooth change in chloride value allows tighter pH control and more stable and predictable chemical applications.

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Abstract

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.

Description

technical field [0001] The present invention generally relates to methods for reducing corrosion in crude distillation units. More specifically, the present invention relates to methods for optimizing system parameters in process streams of a crude distillation unit to reduce corrosion in a crude distillation unit. Specifically, the invention relates to sampling dew point water and collector bottom water, measuring system parameters, and responding to said measurements to reduce corrosion and / or corrosion by-product deposition in crude distillation units. Background technique [0002] In a crude oil refinery, crude oil is typically pumped from storage tanks to a crude distillation unit for processing. The crude distillation unit cleans the crude by water washing in a desalter, and then splits the oil into different fractions in an atmospheric distillation column. These fractions are pumped to various processing units (eg coker, catalytic cracker, hydrotreater, etc.) locate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G7/10C10G75/02
CPCC10G75/02C10G7/10C10G2300/4075C10G7/12C10G31/08C10G75/00G01N17/008G06Q50/04G01N17/006G01N17/04
Inventor G·L·斯卡特古德S·弗格森
Owner NALCO CO
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