Modernizing of a Fluid-Bed Catalytic Cracking Unit
Publication Date: 2012-Jul-17
The IP.com Prior Art Database
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SEP 1 6 1981
Go P. ESCHENBR~,~, RECEIVED
SEP 2 3 198l
MODERNIZING OF A FLUID-BED.CATALYTIC CRACKING UNIT
A. D. Scheiman
The M, W. Kellogg Co. Houston, Texas
SEP ~ ~ 1981
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Money and time allotted for the planned turnaround of a Fluld-bed Catalytic Cracking Unit (FCCU) can, on occasion, be supplemented to enable the refiner to modernize his converter. Naturally, any increase
in capital funds or extension to the planned shutdown time requires a positive justification before management could agree to it. Consequently, goals are set for the converter, modifications to reach these goals are outlined and screening estimates prepared. These estimates are then
used to establish the profitability of any modifications or grouping
of modifications and as backup for a subsequent Authorization for Expendi- ture (AFE) request to management.
Money and time are best utilized when the refiner can modernize his old converter to today's technology - the Ultra-Orthoflow converter (I). Any proposed modification, thus, would modify the old converter to incorp- orate features of the Ultra-0rthoflow converter.
Naturally, the refiner does not start out with the goal to revamp his converter to an Ultra-Ortboflow converter. Rather, he starts with
a revamp requirement or an operating problem requiring solution. In describing the planned revamp work or solving the operating problem, he uses Ultra-Orthflow technology as the reference point or goal.
Table I summarizes capital cost and shutdown construction time estimates developed by the M. W. Kellogg Company'recently. This table
is a composite of several studies prepared for refiners considering revamping their old slde-by-side units during their next scheduled turn- arounds. This paper describes the work (revamp or new) that formed the basis of the table and shows how the work solved the operating problem or responded to a revamp requirement.
It is understood, of course, that each FCCU is unique and the spedial needs of each unit will result in different AFE requests. In one study,
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the refiner concluded that his money and time was best utilized by re- placing his side-by-side converter with a new Ultra-Orthoflow converter.
DESCRIPTION OF EXISTING UNIT
Modifications listed in Table I are to a low pressure slde-by-side eenverter designed and built by The M. W. Kellogg Company in the 1940's. The reactor, regenerator, second stage regenerator cyclones, fractionator, electrostatic precipitator, stack, maintenance elevator and miscellaneous operating exchangers are enclosed in and supported by a massive open steel structure. Also, supported by the structure are other piecesof - equipment that have been abandoned in place during earlier shutdowns. Deterioration of the structure has not occurred, and it can be used for the modernization.
As a result of demolition work done during earlier shutdowns, other new c...