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Title: Delayed coker fractionator advanced control

Abstract

In a delayed coking process, as coke drum switches are made, rapid changes occur in both the fractionator feed rate and composition. With conventional control, it is not unusual to see long transient behavior of large swings in both quality and flowrates of coker gas oils. This can extract a heavy economic toll, not only in coker operation, but in the operation of downstream units as the upset is propagated. An advanced process control application (APC) was recently implemented on the coker fractionator at the Yacimentos Petroliferos Fiscales (YPF), Lujan de Cuyo Refinery, in Mendoza, Argentina. This coker fractionator control design was unique as it handled two different operating objectives: control of product qualities via tower temperature profile during normal operation and control of gas oil product flow ratio during drum switch. This combination of control objectives in one multivariable predictive control program was achieved by including special logic to decouple the individual tuning requirements. Also, additional logic was included to unambiguously detect and identify drum switch and drum steam out as discrete events within 30 seconds of their actual occurrence. These discrete events were then used as disturbance variables to minimize fractionator transient behavior. As a performance measure, themore » overhead temperature was controlled within 2 C to 2.5 C of its target, gas oil flows were stabilized during drum switches and steam generation via pump around was maximized. Overall, implementing advanced control for the delayed coker fractionator resulted in substantial benefits from product quality control, product flow control and minimized energy consumption.« less

Authors:
;  [1]; ; ;  [2]
  1. ABB SIMCON Inc., Houston, TX (United States)
  2. Yacimentos Petroliferos Fiscales, Mendoza (Argentina)
Publication Date:
OSTI Identifier:
5909096
Resource Type:
Journal Article
Journal Name:
Hydrocarbon Processing; (United States)
Additional Journal Information:
Journal Volume: 72:8; Journal ID: ISSN 0018-8190
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; CHEMICAL REACTORS; DESIGN; GAS OILS; COKING; ENERGY CONSUMPTION; PERFORMANCE TESTING; CARBONIZATION; CHEMICAL REACTIONS; DECOMPOSITION; DISTILLATES; ENERGY SOURCES; FOSSIL FUELS; FUELS; PETROLEUM; PETROLEUM DISTILLATES; PETROLEUM FRACTIONS; PETROLEUM PRODUCTS; TESTING; 020400* - Petroleum- Processing

Citation Formats

Jaisinghani, R, Minter, B, Tica, A, Puglesi, A, and Ojeda, R. Delayed coker fractionator advanced control. United States: N. p., 1993. Web.
Jaisinghani, R, Minter, B, Tica, A, Puglesi, A, & Ojeda, R. Delayed coker fractionator advanced control. United States.
Jaisinghani, R, Minter, B, Tica, A, Puglesi, A, and Ojeda, R. 1993. "Delayed coker fractionator advanced control". United States.
@article{osti_5909096,
title = {Delayed coker fractionator advanced control},
author = {Jaisinghani, R and Minter, B and Tica, A and Puglesi, A and Ojeda, R},
abstractNote = {In a delayed coking process, as coke drum switches are made, rapid changes occur in both the fractionator feed rate and composition. With conventional control, it is not unusual to see long transient behavior of large swings in both quality and flowrates of coker gas oils. This can extract a heavy economic toll, not only in coker operation, but in the operation of downstream units as the upset is propagated. An advanced process control application (APC) was recently implemented on the coker fractionator at the Yacimentos Petroliferos Fiscales (YPF), Lujan de Cuyo Refinery, in Mendoza, Argentina. This coker fractionator control design was unique as it handled two different operating objectives: control of product qualities via tower temperature profile during normal operation and control of gas oil product flow ratio during drum switch. This combination of control objectives in one multivariable predictive control program was achieved by including special logic to decouple the individual tuning requirements. Also, additional logic was included to unambiguously detect and identify drum switch and drum steam out as discrete events within 30 seconds of their actual occurrence. These discrete events were then used as disturbance variables to minimize fractionator transient behavior. As a performance measure, the overhead temperature was controlled within 2 C to 2.5 C of its target, gas oil flows were stabilized during drum switches and steam generation via pump around was maximized. Overall, implementing advanced control for the delayed coker fractionator resulted in substantial benefits from product quality control, product flow control and minimized energy consumption.},
doi = {},
url = {https://www.osti.gov/biblio/5909096}, journal = {Hydrocarbon Processing; (United States)},
issn = {0018-8190},
number = ,
volume = 72:8,
place = {United States},
year = {Sun Aug 01 00:00:00 EDT 1993},
month = {Sun Aug 01 00:00:00 EDT 1993}
}