Advanced control improves MHC-VGO unit operation. [Mild HydroCracking-Vacuum Gas Oil]

Journal Article · Wed Mar 01 00:00:00 EST 1995 · Hydrocarbon Processing; (United States)

OSTI ID:6505884

Richard, L; Watson, D ^[1]; Danzinger, F; Tuppinger, D; Schuster, R; Wilmsen, W ^[2]

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1. Setpoint Inc., Houston, TX (United States)
2. OMV AG, Schwechat (Germany)

Constraint and multivariable predictive (MPC) controllers were implemented on an FCC preheater (MHC-VGO unit), which runs in mild hydrocracking (MHC) mode. In only a few weeks following commissioning, better control provided an average reduction in steam use of 38%, an average reduction of 22% in DEA use and a 5 to 10% reduction in fuel consumption. OMV's refinery in Schwechat was commissioned in 1960 and is now one of the largest and most complex inland-refineries in Europe with an annual crude oil processing capacity of 10 million metric tons. Every product stream is desulfurized by hydrodesulfurization (HDS) units. As part of a refinery-wide advanced control (ADVC) project which includes 27 units implemented on four process computers and two DCSs, advanced controls were installed on the MHC-VGO unit. The entire project was executed over a period of two and a half years. The paper describes the process, advanced control, the weighted average bed temperature controller, feed maximization control, stripper feed temperature control, stripping steam/feed ratio controller, stripper pressure minimization, H[sub 2]/oil controller, recycle/DEA ratio controller, stripper bottoms level controller, and advanced control benefits.

• OSTI ID: 6505884
• Journal Information: Hydrocarbon Processing; (United States), Vol. 74:3; ISSN 0018-8190
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
CHEMICAL REACTORS
HEATING
GAS OILS
HYDROCRACKING
HEATERS
COMPUTERIZED CONTROL SYSTEMS
DESIGN
ENERGY CONSERVATION
FLOWSHEETS
PETROLEUM REFINERIES
CHEMICAL REACTIONS
CONTROL SYSTEMS
CRACKING
DECOMPOSITION
DIAGRAMS
DISTILLATES
ENERGY SOURCES
FOSSIL FUELS
FUELS
INDUSTRIAL PLANTS
ON-LINE CONTROL SYSTEMS
ON-LINE SYSTEMS
PETROLEUM
PETROLEUM DISTILLATES
PETROLEUM FRACTIONS
PETROLEUM PRODUCTS
PYROLYSIS
THERMOCHEMICAL PROCESSES
020400* - Petroleum- Processing