Back to results
US 6,270,656 B1Granted
Reduction of coker furnace tube fouling in a delayed coking process
AssigneePetro-Chem Development Co., Inc.
InventorsWilliam C. Gibson, Robert L. Gibson
Life of this patent
Estimating the term…
Abstract
In a delayed coking process, furnace tube fouling is minimized by including a measured amount of full boiling range heavy gas oil as an additive in the furnace feed, preferably by forced recycle from a heavy gas oil stream. An additive is preferably supplied directly to individual furnace tubes by multiple circumferential injection upstream of each tube receiving the additive.
Claims3
A delayed coking process comprising the steps of:
- supplying a feedstock including a natural recycle material to a coker furnace having one or more heating tubes;
- heating said feedstock in said furnace to a coking temperature;
- passing said feedstock to a coke drum to coke said feedstock;
- removing vapors formed in said coke drum;
- passing said vapors to a fractionator;
- condensing a portion of said vapors with a hydrocarbon spray to form at least a portion of said natural recycle;
- combining said natural recycle with said feedstock;
- adding in a circumferential pattern an amount of full boiling range heavy gas oil to said feedstock in at least one location at said furnace;
- and
- said amount being effective to minimize furnace tube fouling.
7 more elements
A delayed coking process comprising the steps of:
- supplying a feedstock including a natural recycle material to a coker furnace having one or more heating tubes;
- heating said feedstock in said furnace to a coking temperature;
- passing said feedstock to a coke drum to coke said feedstock;
- removing vapors formed in said coke drum;
- passing said vapors to a fractionator;
- condensing a portion of said vapors with a hydrocarbon spray to form at least a portion of said natural recycle;
- combining said natural recycle with said feedstock;
- adding in a circumferential pattern to said feedstock an amount of a hydrocarbon additive near the downstream end of the return bend of at least one of said heating tubes;
- and
- said amount being effective to minimize furnace tube fouling.
7 more elements
Dependencies are inferred from the claim text.