Application of abnormal event detection technology to hydrocracking units

Inactive Publication Date: 2006-04-06
EXXON RES & ENG CO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0020]FIG. 14 shows the two di

Problems solved by technology

Due to the fast dynamics of the process, the highly exothermic kinetics of the reactions, and the large degree of interaction between the process equipment of the HDC, abnormal process operations can arise which cause the HDC to deviate from the normal operating state.
Abnormal operations of the HDC can have significant safety and economic consequences.
These situations can cause catalyst or equipment damage, lost production, environmental emissions, inj

Method used

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  • Application of abnormal event detection technology to hydrocracking units
  • Application of abnormal event detection technology to hydrocracking units
  • Application of abnormal event detection technology to hydrocracking units

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Embodiment Construction

[0037] The present invention is a method to provide abnormal event detection (AED) to the operator indicating that sections of a petroleum refinery hydrocracker unit are not functioning properly.

[0038] The method uses fuzzy logic (described below) to inspect multiple supportive evidence of abnormal situations that contribute to an operational problem and estimates its probability in realtime. The probability is presented in a continuous format to alert the operator. This method includes a set of tools which enable the operator to derive the root cause of a problem for focused action. This approach has been demonstrated to provide the operator with an advanced warning of the onset of abnormal operation that can be minutes to hours sooner than the alarm system. With additional time, the operator is able to take action sooner preventing escalation of the event. This method has been successfully applied to the HDC.

[0039] The HDC application uses specific operational knowledge of the p...

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Abstract

The present invention is a method for detecting an abnormal event for process units of a hydrocracking unit. The method compares the operation of the process units to a model developed by principle components analysis of normal operation for these units. If the difference between the operation of a process unit and the normal operation indicates an abnormal condition, then the cause of the abnormal condition is determined and corrected.

Description

[0001] This application claims the benefit of U.S. Provisional application 60 / 609,161 filed Sep. 10, 2004.BACKGROUND OF THE INVENTION [0002] The Hydro Desulfurization and Cracking unit (HDC) is an important process unit within a petroleum refinery. The HDC converts heavy aromatic compounds, typically a combination of cycle oil and coker naptha feeds, into lighter products which can be blended into gasoline and jet fuels. The primary processing equipment for an HDC are multiple sequential fixed bed reactors (for hydrocracking and hydrotreating) and product fractionation columns. Due to the fast dynamics of the process, the highly exothermic kinetics of the reactions, and the large degree of interaction between the process equipment of the HDC, abnormal process operations can arise which cause the HDC to deviate from the normal operating state. Abnormal operations of the HDC can have significant safety and economic consequences. These situations can cause catalyst or equipment damage,...

Claims

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Application Information

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IPC IPC(8): G06F15/00
CPCC10G47/36G05B23/021G05B23/0254G06K9/6247G06F18/2135
Inventor EMIGHOLZ, KENNETH F.KENDI, THOMAS A.WOO, STEPHEN S.
Owner EXXON RES & ENG CO
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