Delayed coker vapor line coke lancing
OwnerMitchell J. Moloney, Sebastian K. Seiderinventors
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Abstract
Systems and methods are provided for coke removal from the coke drum vapor line and/or other conduits between the coke drum and a coker product separation stage, such as a fractionator. A hydro-lance is inserted above the coke drum vapor line in the region where coke removal is desired. The hydro-lance can be inserted through a port, so that the lance is not present during coker operation. The hydro-lance can remove coke from the coke drum line during the water quench (flooding) stage of the coke drum process and/or during the draining step following the quench water cooling step of the coke drum.
Claims20
A method for performing coke removal, comprising:
- exposing a feedstock to delayed coking conditions in a coke drum of a coking reaction system comprising the coke drum, a coke drum vapor line, and a separation stage, the coke drum vapor line providing fluid communication between the coke drum and the separation stage, the delayed coking conditions resulting in coke formation in at least an initial portion of the coke drum vapor line;
- injecting, after the exposing, steam into the coke drum;
- introducing, after the exposing, cooling water into the coke drum;
- draining at least a portion of the cooling water from the coke drum;
- inserting a hydro-lance into the initial portion of the coke drum vapor line, the hydro-lance comprising one or more nozzles, openings, or a combination thereof;
- and
- contacting the coke formed in the initial portion of the coke drum vapor line with water sprayed from the one or more nozzles, openings, or a combination thereof, the water being sprayed at a pressure of 17 MPa-g (˜2500 psig) or more and a flow rate of 19 liter/min (5 gpm) or more,
- wherein the contacting of the coke is at least partially performed during the injecting of steam, during the introducing of the cooling water, during the draining, or a combination thereof.
A delayed coking system, comprising:
- a coke drum comprising a feedstock inlet and a coke drum vapor outlet;
- a coke drum vapor line comprising an initial portion, one or more additional portions, and a coke drum vapor line outlet, the initial portion of the coke drum vapor line being in fluid communication with the coke drum vapor outlet;
- a packing gland comprising a packing gland opening in a wall of the initial portion of the coke drum vapor line;
- a hydro-lance configured to move from a first position within the packing gland to one or more positions at least partially located within the initial portion of the coke drum vapor line by passing through the packing gland opening, the hydro-lance comprising one or more nozzles, openings, or a combination thereof;
- and
- a separation stage in fluid communication with the coke drum vapor line outlet, the coke drum vapor line providing fluid communication between the coke drum and the separation stage.
Dependencies are inferred from the claim text.